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13 September, 18:15

Break apart the addends to find the sum 18+21

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  1. 13 September, 19:24
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    We break apart the first numer:

    10+8

    the second:

    20+1

    and add like this:

    18+21=10+8 + 20+1

    now, we can mix up the order:

    18+21=10+8 + 20+1 = 10+20 + 8+1

    add the parts:

    18+21=10+8 + 20+1 = 10+20 + 8+1=30+9=39
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