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Negative number reasoning with patterns
English: Sandcastle Español: Castillo de arena (Photo credit: Wikipedia) How do you explain that subtracting a negative has the same effect as adding the positive corresponding number? I’ve seen...
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Algebra Tiles- from counting to completing the square
I have become increasingly interested in visual models recently as a way of introducing topics. Visual models have the power to illustrate concepts in their rawest, simplest form without the misleading...
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