devonhiggiow8zpz devonhiggiow8zpz
  • 14-09-2017
  • Mathematics
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How do you do explain how you know that the sum of 12.6 3.1 and 5.4 is greater than 20

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cmerkle8236
cmerkle8236 cmerkle8236
  • 14-09-2017
Round. 5 + 3 + 13 is 21
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AL2006
AL2006 AL2006
  • 14-09-2017
Ignore the decimal parts for a minute, and add up the whole numbers in your head. (12+3+5) is 20 right there. So you know that when you add the decimal parts back in, it'll be more than 20 all together.
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