Solve and explain your "Math Thinking" 12-7

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asked Nov 3, 2017 13.2k views

3 votes

Solve and explain your "Math Thinking" 12-7

Mathematics
middle-school

Alexander Chen asked

by Alexander Chen

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The way I do this is I start at 7, and count up to 12. 7, 8, 9, 10, 11, 12. And then I count how many numbers are there between 7 and 12. And there is 5. This is how I did subtraction in Elementary school.

Glen Scales answered Nov 5, 2017

by Glen Scales

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12 - 7 is 5. you can count down 7 times from 12 like: 12, 11, 10, 9, 8, 7, 6, 5.

Marius Tancredi answered Nov 10, 2017

by Marius Tancredi

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