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

User Nikk
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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.
User Allmighty
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Round. 5 + 3 + 13 is 21
User Bsm
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