How do you do explain how you know that the sum of 12.6 3.1 and 5.4 is greater than 20

Question

Mathematics

Kash Kim

12 October, 16:52

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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Answers (2)

Know the Answer?

Cael Dennis · Answer 1

Cael Dennis 12 October, 17:36

0

Round. 5 + 3 + 13 is 21

Zane Blackwell · Answer 2

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.