The way students think about math has changed a great deal in the last couple of years because the way teachers are asked to teach math has changed.
Do you feel confused about how number lines help with subtraction? Hopefully, these short, student-generated videos will help.
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Using a number line to solve 56-32 (or the difference between 32 and 56).
Finding the difference between 67 and 80 (or 80-67).
And for a little more advanced subtraction, the difference between 59 and 283 (or 283-59).