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One way is to multiply the numbers ignoring the decimal point. If the first multiplicand has d1 digits after the decimal point, and the second has d2 digits after the decimal point, then their product has (d1 + d2) digits after the decimal point.

An alternative for the second stage is to estimate the answer to determine where the decimal point should go.

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7y ago

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Q: What is the rule of multipliying decimal?
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