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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asked Nov 10, 2018 73.7k views

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Allmighty · Answer 1 · 2018-11-13T19:52:41+0000

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.

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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