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It can be very helpful, so the question is inappropriate.

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Q: Why is estimating not helpful when multiplying decimals?

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It is - if you use appropriate rounding. Rounding does not have to be to whole numbers.

why do they move the decimals when multiplying

no.

Yes.

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It is not as helpful when multiplying very small numbers because the numbers are going to be very east to answer. That is why estimating is not as helpful when multiplying very small numbers.

It is - if you use appropriate rounding. Rounding does not have to be to whole numbers.

why do they move the decimals when multiplying

no.

Fractions and decimals are usually rational numbers. Besides, multiplying rational and irrational numbers is also similar.

Yes.

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by estimating the number after the decimal

By rounding the factors, then quickly multiplying them in your head.

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Estimating is not as helpful when multiplying very small numbers because the numbers aare very easy to answer

Very.