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With Halloween around the corner, who could resist a sweet grades 9–12 lesson like this one?

http://illuminations.nctm.org/Lesson.aspx?id=2783

http://illuminations.nctm.org/Lesson.aspx?id=2783

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How do you make learning more accessible to kinesthetic learners? Explore circle theorems with this grades 9–12 lp:http://illuminations.nctm.org/Lesson.aspx?id=3777

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Daniel scored a total of 51 points using the dart board shown. How many times did he hit the inner circle (the shaded circle)?

http://illuminations.nctm.org/BrainTeasers.aspx?id=4956

http://illuminations.nctm.org/BrainTeasers.aspx?id=4956

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Check out the Explorations tab under the Deep Sea Duel interactive for downloadable Instructional & Strategy Guides!

http://illuminations.nctm.org/DeepSeaDuel/

http://illuminations.nctm.org/DeepSeaDuel/

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Do you use books to inspire your lessons? Check out Illuminations' newest grades 3–5 lesson plan:

http://illuminations.nctm.org/Lesson.aspx?id=6561

http://illuminations.nctm.org/Lesson.aspx?id=6561

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Ready to go back to school? Sharpen your mind with this Brain Teaser:

In a four‑digit number, the sum of the digits is 10. All the digits are different. What is the largest such four‑digit number?

http://illuminations.nctm.org/BrainTeasers.aspx?id=3347 for the solution and PDF.

In a four‑digit number, the sum of the digits is 10. All the digits are different. What is the largest such four‑digit number?

http://illuminations.nctm.org/BrainTeasers.aspx?id=3347 for the solution and PDF.

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Have you ever played KenKen? See if you can complete a 6x6 puzzle by the end of summer!

http://illuminations.nctm.org/Activity.aspx?id=4184

http://illuminations.nctm.org/Activity.aspx?id=4184

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What better way to keep your mind sharp during summer break than to do a Brain Teaser?

In the diagram shown, each “path” from top to bottom correctly spells the word MATCH. What is the total number of different paths in the diagram?

http://illuminations.nctm.org/BrainTeasers.aspx?id=4755

In the diagram shown, each “path” from top to bottom correctly spells the word MATCH. What is the total number of different paths in the diagram?

http://illuminations.nctm.org/BrainTeasers.aspx?id=4755

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Did you know that Illuminations' third most popular interactive for 2014 is now optimized for your tablet? How do you use Tessellation Creator (grades 3–8)?

http://illuminations.nctm.org/Activity.aspx?id=3533

http://illuminations.nctm.org/Activity.aspx?id=3533

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Take a look at 2014's most popular grades 6–8 lesson, Order of Operations Bingo

http://illuminations.nctm.org/Lesson.aspx?id=2583

http://illuminations.nctm.org/Lesson.aspx?id=2583

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