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17 April, 05:59

Find the sum of 301 + 173 + 427 using mental math and the associative property of addition. Show how you can use the property to group the two of the address. Explain how you found the sum.

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  1. 17 April, 06:23
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    Mental math and associative property of addition

    i look at 173 and 427 and see that

    73+27=100

    i add now the 100 (from 173) + 400 (from 427) + 100 (see above) = 600

    easy

    600+301=901
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