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Numbers & Operations in Base 10 Subtraction

Subtraction Mistake

What’s the mistake? Why is it tempting?

Thanks to Christopher Danielson for this submission. His blog. His twitter.

2 replies on “Subtraction Mistake”

The mistake is the missing negative sign on the 7 in the tens place.

I often subtract like this: “five hundred negative seventy negative two, that’s four hundred thirty negative two, that’s four hundred twenty-eight.”

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