Adding three digit numbers with regrouping | Addition and subtraction | Arithmetic | Khan Academy
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In the old days 'regrouping' was known as "carrying." It's the same idea now as then: moving the tens (or hundreds or thousands) over to the next column.
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https://www.khanacademy.org/math/arithmetic/addition-subtraction/addition_carrying/v/why-carrying-works?utm_source=YT&utm_medium=Desc&utm_campaign=Arithmetic
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