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in subtraction if dealing with multi-digit problems such as 100 - 73 first you borrow from the 1 in 100 making the 1 a 0 making the first 0 a 10 then borrow from that 10 and make it a 9 and turn the second 0 a 10.... if this makes sense then you are set, but if not, example below

0910

100

-73

____

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12y ago

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Q: What is borrowing in math?
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