Math is Figure-Out-Able!

Ep 125: The Over Strategy - Subtraction


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We just love the Over strategy! In this episode Pam and Kim go through a Problem String to develop the relationships used to think about the Over strategy for subtraction.
Talking Points:

  • Over strategy is a great experience for people new to thinking Real Math.
  • The Over strategy is one of the major relationships that students need to own.
  • A Problem String to nudge the Over strategy.
  • The Over strategy can be tricky, so students need lots of experience and contexts.
  • Modeling student's thinking on a number line helps make thinking visiable as they grapple with the relationships.
  • Teacher moves to modeling that can help support students' thinking.
  • Where does over subtraction fit in the hierarchy?
  • Bonus! The Over strategy "uses" place value (not just place labeling)!


Download free examples of the Over Strategy: mathisfigureoutable.com/over   
Download the free ebook of major strategies: mathisFigureOutAble.com/big

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Math is Figure-Out-Able!By Pam Harris, Kim Montague

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