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  • Kyle Ferreira van Leer

    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?