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Make Math Moments Academy › Forums › Mini-Course Reflections › The Concept Holding Your Students Back › Lesson 4-2: Where Comparison Lives In Additive Thinking – Discussion › Reply To: Lesson 4-2: Where Comparison Lives In Additive Thinking – Discussion

  • Kyle Ferreira van Leer

    Member
    November 1, 2021 at 8:26 pm

    Through the use of number talks, I have loved how I can build these thinking strategies with my middle schoolers, who often leap towards an algorithm (and make mistakes). One wonder I have is how to think about distance between two places as a subtraction structure. I’m inclined to consider it a passive comparison problem, but what about something like the distance between -15 and 18, if they were houses located 15 miles east and 18 miles west. Is this a third “type” of subtraction representation, or does this fall into the passive comparison model?

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