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5 October, 08:49

How does 4 digit addends have a 5 digit sum

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  1. 5 October, 09:14
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    A 4 digit addends could have a 5 digit sum because of the rule of regrouping.

    Regrouping is a situation where carrying and borrowing is involves. So let’s have an example

    8999

    +5678

    14677

    so in this example, we added 8999 to 5678.

    9+8 = 17, so we bring down 7 and carry 1

    9 + 7 = 16 + 1 = 17, so again we bring down 7 carry 1

    9 + 6 = 15 + 1 = 16, bring down 6 carry 1

    8+5 = 13 + 1 = 14, since this is our last number, bring down 14 ...

    => 14, 677
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