## TeachersFirst's Geometry - Grades 9-12

Peruse this collection of geometry resources for grades 9-12. Use these resources to meet the NCTM standards. Many of these tools are ideal for use on your interactive whiteboard or in your BYOD (or 1:1) classroom. Find topics that relate to the content being taught in your classroom. Share these resources with students on your class website. Use these tools for remediation and review with all students. Use these resources in beginner through AP geometry classes. Share these tools with families for at-home practice.

Explore the NCTM Standards

Explore the NCTM Standards for Geometry for All Grades

Geometry Resources for Grades K - 2

Geometry Resources for Grades 3 - 5

Geometry Resources for Grades 6 - 8

Geometry Resources for Grades 9 - 12

Other TeachersFirst Special Topics Collections

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## 25 Results | sort by: Most Recent First Alphabetical Most Viewed First

### CanFigureIt Geometry - CanFigureIt LLC

6 to 12
CanFigureIt is an interactive tool and workspace for exploring and learning about geometric proofs. This tool, developed to help promote problem-solving skills and logical thinking,...more
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CanFigureIt is an interactive tool and workspace for exploring and learning about geometric proofs. This tool, developed to help promote problem-solving skills and logical thinking, provides immediate feedback to student responses. Start as a guest user, or apply for the Proof Ninja Educator Program to receive student reports. Choose from over 450 different topics, then follow prompts to justify claims and make proofs. Take advantage of the included tutorial videos to understand how to use all of the features of the program. Although optimized for Chromebooks, this site works on PC's and Macs but is not optimized for use on mobile devices.

tag(s): angles (50), geometric shapes (130)

#### In the Classroom

Include this site with your other tools for teaching and practicing geography concepts. Be sure to share with students on your webpage or blog for easy access at any time. Apply for the Proof Ninja Educator Program to take advantage of the additional features for monitoring student work. Introduce this site to your students on your interactive whiteboard as you work together to learn geometry concepts. Ask students to show proofs and justifications using the program and take a screenshot of their work. Ask students to include their screenshot within a Google document and share their problem-solving process. This site is an excellent way to differentiate learning for different levels of student understanding. Encourage students to create explainer videos using simpleshow video maker, reviewed here, to modify their learning and to share their understanding with their fellow students. Include those videos on your website for all students to review and access.

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### Scalar Learning YouTube Channel - Scalar Learning

6 to 12

The Scalar Learning YouTube Channel provides videos and tutorials for math, standardized testing, and math music videos. In addition to explicit instruction in several topics, this...more
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The Scalar Learning YouTube Channel provides videos and tutorials for math, standardized testing, and math music videos. In addition to explicit instruction in several topics, this site shares tips for becoming a better student. The site's playlists include "24 Days to Multiplication Mastery" and "Power Pre-Algebra." To find all of the channel's topics, check out the video list and sort by date added or most popular. Each Wednesday Scalar Learning live-streams test prep ideas as part of their video learning podcast.

tag(s): angles (50), charts and graphs (165), data (142), decimals (85), equations (117), fractions (159), geometric shapes (130), inequalities (22), logic (162), mean (20), median (16), mode (13), percent (58), problem solving (219), square roots (15), test prep (68), video (251)

#### In the Classroom

Bookmark this site to view individual episodes together as a class, or use in centers for students to view videos on classroom computers. When using for centers use a site such as MoocNote, reviewed here, to insert comments and questions into any of the videos as part of the student viewing process. Instead of written responses about what they learned or questions they may still have, instruct students share their responses and discussion through video using Flip, reviewed here. Challenge cooperative learning groups to create their own video tutorials using playposit, reviewed here, and share them on a site such as TeacherTube, reviewed here.

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### NCTM Illuminations Geometry Resources Grades 9-12 - NCTM

9 to 12

This portion of the Illuminations site contains over thirty geometry interactives and games for students in grades 9-12. These resources provide activities through problem-solving and...more
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This portion of the Illuminations site contains over thirty geometry interactives and games for students in grades 9-12. These resources provide activities through problem-solving and open-ended questions. All interactives include complete instructions, an exploration, and correlation to standards.

tag(s): area (50), flips (6), geometric shapes (130), logic (162), pi (25), probability (94), problem solving (219), pythagorean theorem (20), ratios (49), turns (3), volume (32)

#### In the Classroom

Keep this site with your professional favorites to find supporting technology and lessons for teaching geometry. As you find practice or extension ideas for student use or at home reinforcement, share specific links on your class web page or classroom computer center for students to access independently or as you assign them for needed practice. The full selection can be overwhelming for most parents, so share the specific areas that fit your curriculum.

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### Geometry Math Is Fun - Math is fun

4 to 12
Geometry Math is Fun provides an extensive catalog of descriptions and explanations for geometry vocabulary. Each clickable link leads to an explanation of terms along with images (some...more
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Geometry Math is Fun provides an extensive catalog of descriptions and explanations for geometry vocabulary. Each clickable link leads to an explanation of terms along with images (some animated) demonstrating and explaining the term. In addition to basic terms, this site includes information on geometric symbols, tools used in geometry, and advanced topics in plane geometry.

tag(s): angles (50), area (50), dictionaries (47), geometric shapes (130), pythagorean theorem (20), symmetry (28)

#### In the Classroom

Use this site on your interactive whiteboard to introduce and reinforce geometry concepts and vocabulary. Be sure to add a link to the site on your class website for students to access at home. Have students create an annotated image including text boxes and related links using a tool such as Thinglink, reviewed here to demonstrate geometry in everyday objects.

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### Mathematical Thinking for English Language Learners - Education Development Center, Inc

5 to 9
Mathematical Thinking for English Language Learners contains 14 math tasks designed for middle school students. Each task includes five support tools: warm-ups, sentence starters &...more
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Mathematical Thinking for English Language Learners contains 14 math tasks designed for middle school students. Each task includes five support tools: warm-ups, sentence starters & frames, word chats, support notes, and a Spanish translation of the task. Tasks focus upon geometry concepts such as area and shapes. Download individual tasks in PDF format using the links provided.

tag(s): area (50), geometric shapes (130), measurement (124), rotation (3), tangrams (7)

#### In the Classroom

Although created for English Language Learners, take advantage of these geometric tasks for use with all students. Use the Sentence Starters and Story Frames as models for incorporating writing into any math lesson. If you are beginning the process of integrating technology, replace paper and pen by having students create blogs sharing their mathematical thinking and understanding using Tumblr, reviewed here. If you are teaching younger students and looking for an easy way to integrate technology and check for understanding, challenge your students to create a blog using Edublog, reviewed here.

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### Math Arguments 180 - Curmudgeon

7 to 12
Find interesting discussion topics for high school math classes at Math Arguments 180. This blog offers 180 days of ideas for discussion in math class. In fact, it has gone ...more
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Find interesting discussion topics for high school math classes at Math Arguments 180. This blog offers 180 days of ideas for discussion in math class. In fact, it has gone beyond 180 and is still counting. Scroll through by date to view topics or search the archives for past posts. Try clicking on the categories to find specific content such as geometry or probability. Find the most popular posts by viewing links on the right side of the home page.

tag(s): logic (162), probability (94), problem solving (219)

#### In the Classroom

Bookmark this blog or subscribe to it with your RSS feed reader to stay current with new posts. Use ideas in your math class as lesson starters, homework, or for extra credit. Have students create an annotated image explaining answers including text boxes and related links using a tool such as Thinglink, reviewed here. Challenge cooperative learning groups to create video explanations and share them on a site such as TeacherTube reviewed here.

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### Earliest Uses of Various Math Symbols - Jeff Miller

8 to 12
Did you know the first known use of the + symbol was sometime between 1323 and 1382? Learn more about this and the origins of other math symbols at this ...more
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Did you know the first known use of the + symbol was sometime between 1323 and 1382? Learn more about this and the origins of other math symbols at this interesting site. Choose from different links to learn about the origins of geometry, fractions, and other symbols. Each description includes a background on its original use along with information about pertinent mathematicians.

tag(s): biographies (95), symbols (14)

#### In the Classroom

Use information from this site to share math "tidbits" with your students on your class webpage or your interactive whiteboard as students enter class. Share this site with students and allow them to explore on their own.The text portions are challenging, so you should pair weaker readers with a partner as they research on this site. Have students use Fakebook, reviewed here, to create a "fake" page similar in style to Facebook about a mathematician.

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### Mathematics Library - Libre Texts - Delmar Larsen

7 to 12
This Mathematics Library is a collaborative, open access library of math textbooks for higher level math. The wiki is constantly updated by university faculty and students to offer...more
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This Mathematics Library is a collaborative, open access library of math textbooks for higher level math. The wiki is constantly updated by university faculty and students to offer an ever-growing resource. Its purpose is to be a supplement to traditional textbooks. Choose the "Mathematics" icon to begin. Choose from several categories such as Algebra or Geometry to continue. Narrow choices within each group to find information by topic. When looking for specific content, use the search bar to find all relevant information. Some content areas contain more information than others.

tag(s): equations (117), probability (94), problem solving (219), statistics (113), STEM (243), wikis (15)

#### In the Classroom

Provide a link to MathWiki on your class website or blog for student use at home. Share information from the wiki on your interactive whiteboard (or projector) to supplement current learning materials. Use the wiki to find questions and student problems for classroom use. Differentiate learning for gifted students using content provided on the wiki.

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### teachMathematics - Jim Noble, Richard Wade, and Oliver Bowles

4 to 12

teachMathematics offers many activities, simulations, lessons, videos, and more for upper elementary through high school math instruction. Choose from the topics of Numbers, Algebra,...more
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teachMathematics offers many activities, simulations, lessons, videos, and more for upper elementary through high school math instruction. Choose from the topics of Numbers, Algebra, Geometry & Measure, and Statistics & Probability. Although this is a subscription site, a large amount of free content is available. Find "Free Stuff" by topic by clicking on the button at the top left of the home page. When on a topic page, click "Free Pages" near the top right of the page.

tag(s): equations (117), factors (28), geometric shapes (130), numbers (120), probability (94), problem solving (219), puzzles (143), statistics (113), symmetry (28)

#### In the Classroom

Make a shortcut to this site on classroom computers and use it as a center. Take advantage of the free lesson plans and interactives by using them for review before a unit test. Share interactives on your projector or interactive whiteboard. Be sure to include this site on your class website or wiki for students to access both in and outside of class for extra practice. Since free activities are somewhat "buried," you may want to post specific links to relevant review activities on your class web page.

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### Free Online Math Calculators and Converters - easycalculation.com

8 to 12
If you need a calculator for almost any situation, look no further than this free resource. Choose from a large assortment of Algebra, Calculus, and Geometry calculators. Other tools...more
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If you need a calculator for almost any situation, look no further than this free resource. Choose from a large assortment of Algebra, Calculus, and Geometry calculators. Other tools include conversions, calendars, cost of living calculators, and countless others (excuse the pun). Find a calculator by browsing the index or use the search bar to find what you need. Be sure to also check out the free online tutorials for several math (and science) topics such as area, algebra, and classic physics.

tag(s): calculators (38), calendars (39), conversions (37), nutrition (132), statistics (113)

#### In the Classroom

Be sure to include a link to these calculators on your class website or blog. Use the cost of living calculators as part of Social Studies lessons to compare the cost of living in different areas of the world. Incorporate health calculators into your nutrition or health unit to discover costs of smoking, calories found in food, and body fat calculators. Enhance learning by having students share their findings by creating online posters using Design Bold, reviewed here.

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### Flipped Math - The Algebros

6 to 12

Would you like to "flip" your Algebra, Geometry, Algebra 2, Pre-Calc, or Calculus classroom but just aren't sure how to get started? Flipped Math has everything you need! Choose a ...more
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Would you like to "flip" your Algebra, Geometry, Algebra 2, Pre-Calc, or Calculus classroom but just aren't sure how to get started? Flipped Math has everything you need! Choose a course to view video lessons and download practice problems, corrective assignments (additional practice for misunderstood concepts or incomplete mastery), and a complete pacing guide. Flipped Math also includes many student resources as well as Teacher and Parent FAQ's. Even if you aren't flipping your classroom, Flipped Math offers valuable teaching tools to use in any Algebra or Geometry classroom.

tag(s): differentiation (74), Online Learning (39), remote learning (62), teaching strategies (38), video (251)

#### In the Classroom

Flipped Math is also perfect for blended learning. Begin your journey into the flipped, blended or remote learning classroom by trying a single lesson or two in which your students have access to view videos at home. Use videos and practice problems found on the site as a supplement to your current lessons. Flipped Math is also perfect for Flipped Learning - Embed videos on your class website or blog for use at home. Even if you are not "flipping," these will make terrific reinforcement for struggling students -- and possibly for parents who want to help, but cannot remember the math skills. Do you want to learn more about flipping your classroom? Find many ideas and suggestions at Flipped Learning Global Initiative.

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### Sketchometry - Sketchometry

4 to 12

This tool 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 ...more
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This tool 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 (137), functions (52), geometric shapes (130), perspective (11)

#### 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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### Yay Math! Videos - Robert Ahdoot

6 to 11

Yay Math! is a series of lively math videos filmed in live classrooms. View videos for Algebra 1, 2, and Geometry concepts. Videos run approximately 15 to 30 minutes in ...more
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Yay Math! is a series of lively math videos filmed in live classrooms. View videos for Algebra 1, 2, and Geometry concepts. Videos run approximately 15 to 30 minutes in length and include an accompanying worksheet. You can preview the first part of the videos. Wait a few seconds to click "Skip this ad." Many videos also include an online quiz. Just enter the access code provided to begin. You will also need to provide a name and email address. These videos are hosted on YouTube. If your district blocks YouTube, then they may not be viewable.

tag(s): angles (50), area (50), charts and graphs (165), equations (117), exponents (35), factoring (25), factors (28), functions (52), geometric shapes (130), inequalities (22), polynomials (21), pythagorean theorem (20), quadratics (25), square roots (15)

#### In the Classroom

If you don't want to provide an email address for quizzes, use a disposable email address tool such as Mail Catch reviewed here to obtain a temporary email address. Share links to videos on your class website or blog and on classroom computers for student viewing. Use videos as inspiration to create your own math videos or challenge cooperative learning groups to create videos and share them on a site such as TeacherTube reviewed here.

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### Science vs Magic - Nico Disseldorp

8 to 12
Science vs Magic offers four tools for exploring math concepts. Tools include Let's Play: Ancient Greek Geometry, Fractal Machine, Logic Grid, and Elementary Cellular Automata. Choose...more
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Science vs Magic offers four tools for exploring math concepts. Tools include Let's Play: Ancient Greek Geometry, Fractal Machine, Logic Grid, and Elementary Cellular Automata. Choose the "About" link with each activity to view the author's blog describing the different components and suggested uses. This is a neat mind-stretcher activity. Explore the site a bit before sharing with students.

tag(s): angles (50), fractions (159), geometric shapes (130), greeks (30), logic (162)

#### In the Classroom

Share this site with students for exploration of geometric concepts. Have students take screen shots of different outcomes then share their explorations with classmates. (Screenshots on a Mac: Shift+ Command+4; on Windows, press the Prtscrn key then PASTE into a document.) Have cooperative learning groups create podcasts demonstrating their understanding of one of the concepts. Use a site such as PodOmatic (reviewed here).

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### Mathispower4u - Video Tutorials - James Sousa

4 to 12

Math Video Tutorials offers 5,000 free math videos organized by course and topic. And the offerings are constantly growing. Videos are hosted on YouTube and SchoolTube and are all 10...more
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Math Video Tutorials offers 5,000 free math videos organized by course and topic. And the offerings are constantly growing. Videos are hosted on YouTube and SchoolTube and are all 10 minutes or less in length. Content includes arithmetic, algebra, geometry, trigonometry, business calculus, and calculus. Each main topic includes links to the videos organized by more specific topics - for example, algebra videos are sorted by an introduction to algebra, rational expressions, equations and functions, equations and percentages, exponential and logarithmic functions, graphing, linear equations, and more. If your district blocks YouTube, the videos may not be viewable.

tag(s): area (50), business (48), charts and graphs (165), equations (117), factoring (25), functions (52), integers (21), measurement (124), operations (74), order of operations (28), percent (58), place value (33), prime numbers (25), ratios (49), test prep (68), tutorials (47), volume (32)

#### In the Classroom

Share videos on your interactive whiteboard as in introduction to a new concept or as review. Embed the links to videos of weekly concepts on your class website or blog. Create a link on classroom computers to current content for students to use as a review resource. Ask students to rate the most helpful videos they find and share their recommendations on a class wiki. Share this site with parents to use as a resource when helping students at home. Challenge students to create their own how-to video of math concepts. Share the videos using a tool such as SchoolTube, reviewed here.

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### Geometry: The Supplement - Dan Meyer

7 to 11
This site contains 38 weeks of Geometry lessons provided in several formats to be easily used with interactive whiteboards. Dan Meyer is well known for his mathematics teaching methods...more
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This site contains 38 weeks of Geometry lessons provided in several formats to be easily used with interactive whiteboards. Dan Meyer is well known for his mathematics teaching methods and much of the material is hands-on, problem-based activities appropriate for any classroom. Lessons are in slide format and can be downloaded in Keynote (Mac) or PowerPoint (Windows). In addition, each week's lessons can be downloaded as a PDF. Each lesson contains slide notes for the teacher and weekly handouts are available for use. Textbook assignments reference Discovering Geometry; however, these materials can be used with any textbook or materials. Each week's lessons are also tagged making it easy to find other similar content within the site.

tag(s): angles (50), functions (52), geometric shapes (130), patterns (60), problem solving (219), test prep (68), tutorials (47)

#### In the Classroom

Use the lessons provided on your interactive whiteboard or projector either on their own or as a supplement to current classroom materials. This could also be used as enrichment/advancement for gifted students or supplemental practice for struggling math students. Consider providing this link on your class website.

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### Virtual Nerd - Josh Salcman

8 to 12

Virtual Nerd is a FREE unique, online resource offering students real help in math. Current topics include middle grades math through algebra 2, geometry, and SAT math topics. Within...more
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Virtual Nerd is a FREE unique, online resource offering students real help in math. Current topics include middle grades math through algebra 2, geometry, and SAT math topics. Within each topic are many subtopics offering videos along with a written explanation of the problem.

tag(s): equations (117), functions (52), test prep (68), tutorials (47), variables (14), video (251)

#### In the Classroom

Display videos on your interactive whiteboard or projector as an introduction or review to current topics. Create a link on classroom computers for students to view videos for review. Post the link to this site on your classroom website for students to access at home.

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###### More

9 to 12
In this Ask Asia lesson plan, students construct their own Islamic geometric patterns as they study the patterns as analogies for the Islamic cultural beliefs. ...more
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In this Ask Asia lesson plan, students construct their own Islamic geometric patterns as they study the patterns as analogies for the Islamic cultural beliefs.

tag(s): religions (71)

#### In the Classroom

Take advantage of the free lesson plan and use it on a unit concerning Geometry in the world around us. The lesson plan is a different way for students to recognize geometric patterns in the world around them. Use the interactive whiteboard or projector to show some of the sample images and essays provided by the site on the topic before allowing students to create their own designs.

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### Harmony and Proportion - John Boyd-Brent

9 to 12

These pages attempt to provide a simple introduction to, and explanation of, the principles governing harmony and proportion in space. The concepts link visual art and math/geometry...more
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These pages attempt to provide a simple introduction to, and explanation of, the principles governing harmony and proportion in space. The concepts link visual art and math/geometry in very sophisticated ways. Links include Plato: Composition, Pythagoras: Music & Space, Alberti: Harmony & Proportion, Palladio, and The Square Root of Two. Some sections are quite complicated and are best suited for either gifted students or whole-class exploration; however, there are some interesting concepts to explore within the site. The Pythagoras portion has an interesting audio and visual portion explaining number (weight) and musical tone.

tag(s): ratios (49), square roots (15)

#### In the Classroom

Explore the site with your class on your interactive whiteboard or projector. Be sure to bring up some sample images on the board and apply or explore some of the concepts and annotate images using the pen tools. Share the site as a resource when researching famous mathematicians. Share the site with music, art, and social studies teachers to use as a resource. Use this site for research and have students complete a multimedia presentation using a site such as Smilebox (reviewed here) to create a slide show, collage, or more.

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### Math Interactives - Utah Education Network

7 to 12

Find great math resources on this free site on countless topics. Click each resource to find sites useful on individual computers or projected on a whiteboard screen. Be sure to ...more
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Find great math resources on this free site on countless topics. Click each resource to find sites useful on individual computers or projected on a whiteboard screen. Be sure to test out each interactive prior to using with a class, as some require Flash or other programs. Find great games about Numbers and Operations, Algebra, Geometry, Probability, and Money. Though these interactives are labeled for grades 7-12, several can be used by K-5 teachers i.e. the number line interactives. Be aware of the icons next to the resource for the required plug ins to use. Click on an activity and then explore the tabs above. Click the "Learner" tab to view information about the topic. Click "Help" for information on how to use the activity. Find resources in the "Instructor" tab. There is a wealth of material here, so be sure to check it out!

tag(s): data (142), money (117), numbers (120), probability (94)

#### In the Classroom

Use these resources for review and to reinforce concepts from class. Create teams of students who complete the activity taking turns on a whiteboard or with individual computers. Use the activity as a lead in to the topic of the day. Ask students what they notice about the activity and the general rules that they notice about the topic. Provide this link on your class website for students to use at home for extra practice, enrichment, or to try some new advanced topics.