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21 April, 20:14

Use rounding or compatible numbers to estimate the sum. 256+321

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  1. 21 April, 20:28
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    Since 256 is rounded to 260 and 321 is rounded to 320, 260+320 = 580. So, 256+321 is about 580.
  2. 21 April, 20:30
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    You take 260 is close to 256, and 320 is close to 321, so 260+320=580.

    About 580.
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