Rounding Numbers (But Not To 10)

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Summary

What could we possibly do to make rounding more interesting for students who already get it? In this series, students consider how they might round to values other than “the nearest 10.” How, for example, do we round to the nearest 9? 7? 15?

  1. Round 15 to the nearest 9. Should it round up to 18 or down to 9?
  2. Create a rule for rounding up to the next 9. Round three more numbers to the nearest 9.
  3. Create a rule for rounding up to the next 7, 15, and 18.
  4. See how to expand this rule to round to any number.
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