Check out this number game to solve and then challenge yourself to explain your math thinking.

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Go to The Mind Reader website created by Transum and follow the instructions
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Record all of your math step by step on your paper
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Look for patterns
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Brainstorm on possible reasons why The Mind Reader is able to predict your symbol every time.
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At the end of the 5 minutes, write a several sentences about how you think this game works.
lesson adapted from https://www.transum.org/Maths/Investigation/Mind_Reader/ and Yummy math