How Many Will There Be? Xs and Os

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Summary

Give kids a taste of a sequence, let them build an understanding, and then see how far their predictions can take them.

  1. Students look for patterns and predict how many Xs will be at step 10.
  2. I reveal the solution (it's 31) and ask students to predict step 50.
  3. After showing my solution (there are 151 Xs) I challenge students with a new formation of Xs and Os. (The secret: in this version, you start with 4 Xs and add 12 Xs at each step.)

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