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Slackmath - Geoffrey Slack

Grades
6 to 9
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Slackmath brings worksheets into the 21st Century by adding video explanations accessible via QR codes. Choose from a large collection of Algebra worksheets to download. Embedded in...more
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Slackmath brings worksheets into the 21st Century by adding video explanations accessible via QR codes. Choose from a large collection of Algebra worksheets to download. Embedded in each worksheet is a QR code. Scan the QR codes to view correct responses to problems and a video explaining the problem solution. Be sure to sign up for newsletter updates as the author intends to add additional worksheets and subjects. Most of the videos are hosted on YouTube. If your district blocks YouTube, they may not be viewable. You could always view the videos at home and bring them to class "on a stick" to share. Use a tool such as KeepVid reviewed here to download the videos from YouTube.

tag(s): qr codes (19), video (164), worksheets (38)

In the Classroom

Create a link to Slackmath on your class website or blog as an excellent resource for practice and review of Algebra concepts. Share Slackmath as a way to review before tests. Use Slackmath as inspiration for creating worksheets for any topic using QR codes and video explanations. Challenge students to create instructional videos using a tool such as SchoolTube reviewed here and to link to their videos by QR code. This is a great resource to share with students then allow them to create their own practice and review activities. Have them create math problem challenges for the class, projecting both the problem and the QR code to the solution video! Classmates can scan the QR code with their smartphones or tablets to check their answers, all inspired by Slackmath.
  This resource requires Adobe Flash and PDF reader software like Adobe Acrobat.

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Math Concentration - Wanda Collins

Grades
5 to 12
2 Favorites 0  Comments
  
Explore this rich resource of videos, tutorials, worksheets, and more for reinforcing and teaching math content. Select a Subject (specific math topic) to view explanations and activities...more
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Explore this rich resource of videos, tutorials, worksheets, and more for reinforcing and teaching math content. Select a Subject (specific math topic) to view explanations and activities such as multiplying decimals or finding the mean. Choose Videos to explore over 1500 tutorials. Be sure to check out the worksheet area offering more than just print-and-use worksheets. Offerings include worksheet generators to produce and create your own problems. The free homework help forum is very useful for students and parents alike. The site also includes an excellent overview and explanations (via video) about Common Core. If your school blocks YouTube, then they may not be viewable. You could always view the videos at home and bring them to class "on a stick" to share. Use a tool such as KeepVid reviewed here to download the videos from YouTube.
This site includes advertising.

tag(s): commoncore (82), decimals (110), factors (39), fractions (206), geometric shapes (110), mean (24), median (22), mode (14), ratios (47)

In the Classroom

Bookmark Math Concentration for use throughout the school year. Share a link (or embed) videos on your class website or blog as a support for at-home learning. Link to videos on classroom computers. View videos on your interactive whiteboard (or projector) as a supplement to current lessons. Be sure to sign up for the Math Concentration blog to receive updates with new posts. The free homework help forum is very useful for students and parents alike. Include it in your class newsletter or web page.
  This resource requires Adobe Flash and PDF reader software like Adobe Acrobat.

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TenMarks - Rohit Agarwal and Andrew Joseph

Grades
1 to 12
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TenMarks is an online support program for math instruction in grades 1-12. All instruction is correlated to Common Core Standards for use as a supplement to classroom instruction. Create...more
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TenMarks is an online support program for math instruction in grades 1-12. All instruction is correlated to Common Core Standards for use as a supplement to classroom instruction. Create your free account to begin. (One grade level is included with a free subscription.) Follow prompts to add your class roster. Create your curriculum using the drag and drop feature that allows 3 additional folders from other grade levels for additional support or enrichment. Assign topics to your whole class or individual students. When students complete assignments receive instant feedback through automatic grading and analysis of their most common mistakes. Videos and hints assist students throughout the assignments providing feedback and support along the way. Some of the video clips require YouTube. If your district blocks YouTube, then they may not be viewable. You could always view the videos at home and bring them to class "on a stick" to share. Use a tool such as KeepVid reviewed here to download the videos from YouTube.
This site includes advertising.

tag(s): differentiation (20), gifted (66)

In the Classroom

Create a class account and provide login information to students. Share a link on your class website or newsletter for students to practice on their own. Use TenMarks as a great resource for differentiating needs among your students. Create a link on classroom or computer lab computers for in-school use. Share with other teachers in your building to supplement Common Core lessons. TenMarks isn't only for students needing extra support. Use with gifted students to supplement and enrich learning. Use TenMarks for homework assignments. Be sure to set the due date of the assignment.

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MathFights - MathFights Ltd.

Grades
9 to 12
1 Favorites 0  Comments
Compete in the ultimate Math Challenge with opponents from around the globe on MathFights! Registration is required to access this site, and it requires email. The questions are challenging,...more
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Compete in the ultimate Math Challenge with opponents from around the globe on MathFights! Registration is required to access this site, and it requires email. The questions are challenging, much like those in Math Counts and other math competitions. Begin working your way up from division 10 all the way up to the highest level, division 1. Choose the "Fight" button to connect with a challenger. You can also challenge a friend registered with the site. Each round consists of five multiple choice questions to answer within the given time. Speed and accuracy scores determine the winner for each round. Following each round is an opportunity to review each task and view correct answers and explanations for incorrect responses. Be prepared, MathFights will offer a challenge to even the brightest math minds!

tag(s): gifted (66), logic (199), mean (24), order of operations (30), problem solving (170)

In the Classroom

Create a class MathFights account and have students play on your interactive whiteboard or projector. Allow students to create their own accounts using Gmail subaccounts and challenge each other from computer centers. Read tips for safely managing email registrations here. Create a link on your class webpage or blog and challenge students to share their levels and competition results. Choose difficult questions from MathFights to use as challenge problems in class. MathFights is excellent for use with gifted students as a Math challenge at any time they have completed lesson objectives.

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patrickJMT's Math Channel (YouTube) - Patrick Jones

Grades
8 to 12
1 Favorites 0  Comments
  
Discover and explore what is considered to be one of the best math channels on YouTube. Patrick's channel is all about sharing math ideas and content to make math easier ...more
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Discover and explore what is considered to be one of the best math channels on YouTube. Patrick's channel is all about sharing math ideas and content to make math easier and more understandable to all. Browse through videos sorted in the order uploaded or by popularity. Use the search to find specific content. Most videos run 10 minutes or less, making content easy to use as a supplement to existing lessons or for extra help. The videos are not done "Hollywood" style, but they do explain things well. If your district blocks YouTube, they may not be viewable. You could always view the videos at home and bring them to class "on a stick" to share. Use a tool such as KeepVid reviewed here to download the videos from YouTube. To remove all of the "clutter" and advertisements from YouTube try Quietube reviewed here.
This site includes advertising.

tag(s): equations (124), functions (57), integers (41), number lines (13), polynomials (26), probability (100), problem solving (170), quadratics (28), square roots (22), variables (23), vectors (23)

In the Classroom

Share these videos on your interactive whiteboard or projector. FLIP your classroom and have students view the videos at home and discuss the content the next day in class. (This is a great option if YouTube is blocked in your school.) Use the videos to introduce math content or review any topic. Be sure to provide this link on your class website for students (and their families) to access at home for additional math practice or help. Sometimes seeing a slightly different explanation helps understanding.
 This resource requires Adobe Flash.

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Math with Mr. Almeida YouTube Channel - Joseph Almeida

Grades
K to 12
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Math with Mr. Almeida is an extensive YouTube channel of math videos aligned to Common Core Standards and more. There are many unique topics and even some math raps! Video ...more
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Math with Mr. Almeida is an extensive YouTube channel of math videos aligned to Common Core Standards and more. There are many unique topics and even some math raps! Video titles begin with the actual Common Core Standard addressed and a summarizing phrase of the content. Scroll through the playlists to find videos sorted by grade levels from Kindergarten through High School. Subscribe to Mr. Almeida's channel to receive notice of new uploads. If your district blocks YouTube, the videos may not be viewable. You could always view the videos at home and bring them to class "on a stick" to share. Use a tool such as KeepVid reviewed here to download the videos from YouTube.
This site includes advertising.

tag(s): addition (206), angles (73), area (50), commoncore (82), decimals (110), fractions (206), geometric shapes (110), mixed numbers (11), place value (47), probability (100), video (164), volume (35)

In the Classroom

Bookmark and save this YouTube channel for use throughout the school year when teaching math lessons. Use the embed code or links to share videos on your class website or blog to "flip" your class, having students watch them before class discussion and practice. Or view videos together on your interactive whiteboard or projector. Set up a video chat time during the evening using one of these YouTube videos using a tool such as Watch Together, reviewed here. To share a single video from this site without all the YouTube clutter, use a tool such as SafeShareTV, reviewed here and create a shortcut to the SafeShare page directly on the desktop.
 This resource requires Adobe Flash.

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cym@th - Cymath.com

Grades
7 to 12
1 Favorites 0  Comments
Solve Calculus and Algebra problems step by step using cym@ath's problem solver. Begin by choosing an action from the drop-down box: solve equation, simplify, or other choices. Then...more
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Solve Calculus and Algebra problems step by step using cym@ath's problem solver. Begin by choosing an action from the drop-down box: solve equation, simplify, or other choices. Then enter the problem. Problems automatically format as you enter them. Click Solve to view the step by step process to obtain the answer along with rules used, if applicable. Click on the rule to view an explanation and example. Scroll through links to all reference material. Never before has "solve for X" been so instantaneous! You can even copy a direct link to the solution to share it with others.

tag(s): equations (124), factoring (27), fractions (206), problem solving (170), quadratics (28), quotations (21)

In the Classroom

This site is perfect for use on your interactive whiteboard or projector. Use with practice problems or when comparing different processes for obtaining solutions. Create a link on classroom computers for students to use when checking work. Share a link on your class website for students to use at home. Have students provide their attempts at problem solving. Print the solution using cym@th. Have students share where they were stuck or having problems in finding a correct answer. How do you prevent this from becoming an instant homework "cheat"? Always start with actual word problems, not equations, so students must first generate their own equations. Require students to "show their work" on paper as they solve, including the explanation of each step. Even if they are copying from the web site, they are still copying down the explanations. If they use their own words, that will show comprehension. How else could you prevent using this tool as a "cheat"? Feel free to add a comment!

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Sketchometry - Sketchometry

Grades
4 to 12
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This tool (currently in Beta) is an amazing geometry playground. Select points on your screen and connect them. On tablets, draw roughly with your finger (such as a circle), and ...more
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This tool (currently in Beta) is an amazing geometry playground. Select points on your screen and connect them. On tablets, draw roughly with your finger (such as a circle), and the tool will generate a real circle. Use the Help page to identify the gestures that can be used on a tablet. The interface uses icons that are easy to find and follow. This web tool is designed to work on mobile browsers on any device.

tag(s): DAT device agnostic tool (49), functions (57), geometric shapes (110), perspective (9)

In the Classroom

This tool is great for creating and visualizing math concepts from basic geometric shapes and area to complex constructions and trig. Use on a whiteboard or with a class projector for interactive classroom use. Save or retrieve creations with Dropbox, reviewed here or Google Drive, reviewed here. Use for hands-on work with any geometry or trigonometry functions. Since this tool works on such a variety of devices, it would be ideal to use in a BYOD (or 1:1) geometry class. Art teachers who want to "draw in" their more mathematical students can offer this as a design option, especially when teaching about perspective.
 

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Free Practice Tests - Varsity Tutors

Grades
9 to 12
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Free Practice Tests is an excellent resource for practice tests, flashcards and a question of the day for upper level mathematics. View topics in alphabetical order from Accuplacer...more
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Free Practice Tests is an excellent resource for practice tests, flashcards and a question of the day for upper level mathematics. View topics in alphabetical order from Accuplacer Arithmetic Tests through VTNE Tests. Some topics contain several tests such as the SAT Math Tests which contain 46 tests Some topics only include one test. In addition to the test, view the test's difficulty level and average time spent to complete. Each topic also includes flashcards for quick review. Flashcards contain a problem, multiple choice answers, the solution, and an explanation for the correct answer.
This site includes advertising.

tag(s): advanced placement (13), flash cards (43), test prep (82)

In the Classroom

Use Free Practice Tests flashcards on your interactive whiteboard (or projector) to practice standardized testing material. Display the problem of the day on your interactive whiteboard as a class warm-up. Have students complete the problem of the day at home for daily homework. Be sure to share a link to the site on your class webpage or blog for students to use for at-home practice. Be aware this site advertises for tutors. However it isn't necessary to register or be a tutor to use materials on the site.

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Just Math Tutorials - Patrick JMT

Grades
8 to 12
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Just Math Tutorials offers many math video tutorials covering content in Algebra through Calculus and Trigonometry. Search by specific topic or scroll through categories. Each...more
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Just Math Tutorials offers many math video tutorials covering content in Algebra through Calculus and Trigonometry. Search by specific topic or scroll through categories. Each video is fairly short, most under 10 minutes. Click on tags under videos to easily find videos with related content. Videos are hosted on YouTube. If your district blocks YouTube, then they may not be viewable. You could always view the videos at home and bring them to class "on a stick" to share. Use a tool such as KeepVid reviewed here to download the videos from YouTube.

tag(s): charts and graphs (176), decades (13), division (137), equations (124), exponents (37), factoring (27), factors (39), inequalities (22), multiples (31), multiplication (188), polynomials (26), quadratics (28), ratios (47), venn diagrams (15)

In the Classroom

Be sure to save this site in your favorites (or bookmark) for use throughout the school year. View videos on your interactive whiteboard or projector. Create a link on classroom computers for students to view on their own. Share a link on your class website or blog for easy home reference. If students discover a particularly helpful video, encourage them to "review" it, explaining how it helped them understand. With so many math video collections available, your students can become "video critics."
 This resource requires Adobe Flash.

Comments

Unfortunately, Patrick tends to make mistakes in some of his presentations. It is important to view the presentations before assigning them to students.

Editor's Note: Thank you for making us aware of that you found an errors in a presentation. As far as our editorial team can tell after checking with the commenter above, this was single incidence. It is always wise for teachers to preview anything you will use in class.
Honora, FL, Grades: 6 - 12

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Free Math Worksheets - Pre-Algebra through Calculus - Kuta Software

Grades
7 to 12
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Find and print many worksheets for upper level math skills. Worksheets are divided by subject and content at this easy to navigate site. Subjects include Pre-Algebra, Algebra I, Algebra...more
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Find and print many worksheets for upper level math skills. Worksheets are divided by subject and content at this easy to navigate site. Subjects include Pre-Algebra, Algebra I, Algebra 2, Geometry, and Calculus. Choose your course then topic area to find a problem set. Click to print. View answers on a copy of the worksheet included.
This site includes advertising.

tag(s): area (50), equations (124), exponents (37), factoring (27), factors (39), geometric shapes (110), inequalities (22), polynomials (26), quadratics (28), ratios (47), transformations (14), volume (35)

In the Classroom

Bookmark and save this site for use throughout the year. Quickly download and print worksheets for review. Use with a substitute or for extra student practice. Share a link to the site on your class website for students to access at home for review and practice of concepts.
 This resource requires PDF reader software like Adobe Acrobat.

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Activate Instruction - Diane Tavenner

Grades
K to 12
2 Favorites 0  Comments
     
Activate Instruction is a free tool to create and share personalized instruction through playlists similar to those used for music listening. This tool can be used by teachers, parents,...more
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Activate Instruction is a free tool to create and share personalized instruction through playlists similar to those used for music listening. This tool can be used by teachers, parents, and students. Search by Common Core standards to find resources to add to playlists or for immediate use. Create your own playlists after registering on the site. Students and parents access materials by following their teacher's playlists. Include resources such as videos, worksheets, animations, and self-created material on your playlist. Be sure to watch the introductory video for an overview of how to use Activate Instruction. Although the search provides all grade levels, at the time of this review most content was geared toward upper elementary students and above.

tag(s): bookmarks (55)

In the Classroom

Introduce this site on your interactive whiteboard or projector. Share with students and parents as a resource for finding personalized learning materials. Search for ready-made playlists to share with students for any instructional unit. Create your own and share with students on your classroom website. Share with other teachers as a way to collaborate on playlists for any classroom topic. Personalize playlists to differentiate for ability levels within your class.

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Project Euler - Project Euler

Grades
6 to 12
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Project Euler offers a series of challenging mathematical and computer programming problems developed to enhance problem solving skills and challenge anyone interested in math. These...more
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Project Euler offers a series of challenging mathematical and computer programming problems developed to enhance problem solving skills and challenge anyone interested in math. These seemingly simple challenges would be great starter coding activities or can be solved with clever application of math. Choose the Problems link to view a list of problems with titles such as power digit sum and quadratic primes. Each problem links to the explanation and question. Project Euler doesn't provide solutions to problems. However, someone has done the work for you: visit here for a list of correct answers and a link to a discussion board where math whizzes discuss and share strategies to solve them. Optional registration allows you to track your progress. Registration does require an email address, but again, it is optional.

tag(s): equations (124), factors (39), fractions (206), geometric shapes (110), integers (41), logic (199), prime numbers (27), puzzles (176), pythagorean theorem (27), quadratics (28), roman numerals (5)

In the Classroom

Use Project Euler as an excellent resource for challenge problems for students. Keep the solutions handy for students to compare their own or perhaps provide the answer to a few examples as a starting point. Challenge students to document how to write code to solve the problem and find the correct answer. If you use the problems as a class activity require students to make a screencast or video explaining how they solved it. Collect the "how to" videos on TeacherTube and include them on a Project Euler wiki. Offer these challenges to your gifted or highly able math students who test out of required units.

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EngageNY Video Library - New York State Education Department

Grades
K to 12
1 Favorites 0  Comments
   
EngageNY offers a video library and pedagogical tools to aid teachers implementing Common Core. Although this site is mainly math, there are also some ELA resources/ideas. Search the...more
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EngageNY offers a video library and pedagogical tools to aid teachers implementing Common Core. Although this site is mainly math, there are also some ELA resources/ideas. Search the site using filters for content, grade level, or type of resource. Video topics include professional resources and also lesson ideas. Videos range in length from 5 to over 40 minutes.

tag(s): commoncore (82), professional development (60)

In the Classroom

This is a great site to share during professional development days. Share the parent video during your Open House or Meet The Teacher night. Bookmark and view videos to help understand implementing Common Core in your classroom. Check back frequently to see what has been added. Find ideas for specific lesson ideas.

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Tutrr - Practice and Improve Math Skills - Tutrr.com

Grades
7 to 12
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Practice math using these interactive applications from Tutrr. Although based on books from India and other locations, the math is applicable to any similar math instruction or program...more
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Practice math using these interactive applications from Tutrr. Although based on books from India and other locations, the math is applicable to any similar math instruction or program -- with a few slight adjustments to vocabulary terms. Choose a book to begin. Explore contents including a syllabus and subjects such as Algebra and Geometry. Pick from content within each topic. Follow specific directions for each problem. Many problems provide hints and the option to check solutions when complete. Create a free login to save work.

tag(s): area (50), data (130), decimals (110), fractions (206), geometric shapes (110), percent (70), probability (100), problem solving (170), quadratics (28), statistics (100), symmetry (46), test prep (82), transformations (14), volume (35)

In the Classroom

Share Tutrr with students as an excellent way to practice and review concepts at home. Be sure to clarify any difference in terms so they can find what they need. There is a slight learning curve to using the site correctly. Demonstrate on your interactive whiteboard or projector. Have students practice the program in class (if possible) before trying it at home. Have students explore and share tips on how to input answers correctly. Make a shortcut to this site on classroom computers and use it as a center. Be sure to include this site on your class web page for students to access both in and outside of class for further practice.

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Classic Mistake Math - Calculator Software

Grades
4 to 12
1 Favorites 0  Comments
 
Classic Mistake Math is a gallery of posters and accompanying audio files demonstrating classic math mistakes. Choose color or black and white to download any poster in PDF format....more
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Classic Mistake Math is a gallery of posters and accompanying audio files demonstrating classic math mistakes. Choose color or black and white to download any poster in PDF format. Listen to an explanation of the mistake by choosing the mp3 option. Download audio explanations through a simple right click. This site was created in the United Kingdom. American English speakers may notice some slight differences.

tag(s): decimals (110), exponents (37), fractions (206), multiplication (188), negative numbers (19), prime numbers (27), time (124)

In the Classroom

Bookmark and save this site for classroom use throughout the year. Show a poster on your interactive whiteboard and have students explain the mistake shown in the poster. Use this site as a model for students to create their own classic mistakes posters with errors made in the classroom. Have students upload a photo they have taken and add voice bubbles to explain what they learned by using a tool such as Superlame, reviewed here. After a test, ask students to look for their own mistakes on this site -- or on posters you have printed and hung in your classroom -- as a sort of visual "error analysis"

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Next Vista for Learning - Rushton Hurley

Grades
3 to 12
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Next Vista offers Learning videos for teachers looking for alternatives to YouTube. At the time of this review, they offered over 1,000 videos (most useful for in the classroom). Videos...more
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Next Vista offers Learning videos for teachers looking for alternatives to YouTube. At the time of this review, they offered over 1,000 videos (most useful for in the classroom). Videos are made by teachers and/or students. Search by three main topics: Light Bulbs, Global View, or Seeing Service. Better yet, use the right sidebar to search by topic: Math, Science, World Languages, History & Culture, Performing Arts, and more.Next Vista offers an extensive collection of career videos to use as a resource for exploring and discovering career opportunities. View videos directly on site or share using the link or embed code provided. Throughout the school year, Next Vista hosts video creation contests for students and teachers. Submit your own videos less than 5 minutes in length using directions provided. They even offer small prizes for winners.

tag(s): africa (178), asia (68), careers (105), computers (36), europe (63), literature (218), musical instruments (27), musical notation (19), north america (18), parts of speech (61), poetry (209), shakespeare (132), south america (31), speech (84), video (164)

In the Classroom

Explore the various topics to share with your students. In the math section, share the "How to Show Your Work" video on your projector or interactive whiteboard. There are useful videos in all sections, offered at a variety of levels. Bookmark and save this site for use throughout the year for student and teacher created videos. Challenge students to create a video to submit for one of the site's contests; who knows, they may win!

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Brilliant - Sue Khim

Grades
8 to 12
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Brilliant provides challenges for anyone with a passion for mathematics or physics. Create an account, enter your interests, and take a short diagnostic test to receive an assigned...more
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Brilliant provides challenges for anyone with a passion for mathematics or physics. Create an account, enter your interests, and take a short diagnostic test to receive an assigned level in either subject. You must create an account using an email address or Facebook. Each week, you will receive new problem sets based on your assigned level. If you answer correctly within three attempts, you receive points toward prizes or academic opportunities. Warning: This site can get addictive.

tag(s): problem solving (170), STEM (50)

In the Classroom

Use when differentiating in the classroom or as a resource for gifted students. Allow students to create their own account, take placement tests, and problem-solve the challenges each week. Have students share problems and their problem solving process with classmates via podcasts demonstrating their understanding of one of the concepts. Use a site such as PodOmatic (reviewed here). Create your own account; then share problems on your website or blog using the share feature offered on the site. If you plan to have students register using their own email accounts, read tips for safely managing email registrations here.

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Illustrating the Standards for Mathematical Practice - National Council of Supervisors of Mathematics

Grades
K to 12
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Explore the language and sample tasks of national Common Core Standards. This site is geared towards professional development for math in all grade levels (K-12). Choose from modules...more
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Explore the language and sample tasks of national Common Core Standards. This site is geared towards professional development for math in all grade levels (K-12). Choose from modules sorted by grade level and topic to begin. Suggested length of each module is 2-3 hours. Modules include videos for you to see sample lessons as well as downloadable PowerPoint presentations and PDFs including resources. NCSM is a division of NCTM.

tag(s): commoncore (82), numbers (176), order of operations (30), patterns (70), problem solving (170), professional development (60), quadratics (28)

In the Classroom

Has your professional development money dried up? This is a great, free resource for high quality materials to complete on your own or with fellow teachers. Divide modules into portions to use for professional development throughout the year. Share the video clips on your interactive whiteboard or projector for whole group interaction/participation.
  This resource requires Adobe Flash and PDF reader software like Adobe Acrobat.

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High School Math Help - University of Houston Mathematics Department

Grades
9 to 12
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Find online quizzes and video tutorials for Algebra 2 through AP Calculus and Statistics. Choose a course to begin, and follow directions to register for quizzes and videos. At the...more
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Find online quizzes and video tutorials for Algebra 2 through AP Calculus and Statistics. Choose a course to begin, and follow directions to register for quizzes and videos. At the time of this review, the AP Calculus portion contains the most information, with many videos sorted and labeled by content.

tag(s): area (50), equations (124), fractions (206), functions (57), statistics (100), variables (23), video (164), volume (35)

In the Classroom

This site is excellent for enrichment or reinforcement. Include it on your class web page for students to access both in and out of class. Share directions for enrolling in quizzes with students, and allow them to use them as a resource for studying and reviewing class information. Create a link to videos on your classroom computers for students to view and study.
 This resource requires PDF reader software like Adobe Acrobat.

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