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How does an estimate help you place the decimal point when multiplying 3.9 and 5.3

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rachelacarman
Well, Mathematicians are lazy and they don’t want to have to multiply “large numbers” so they round them to make their life easier. For example: 3.9 rounds to 4, and 5.3 rounds to 5, do just multiply 4 and five.
Rubyred11
3.9= 4
5.3= 5

I don’t know if that’s correct

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