When multiplying decimal numbers and you have multiplied the numbers ignoring the decimal points, add the number of decimal places in each factor. Then, start at the far right of the whole-number product and move its decimal point that many places to the left.

Question

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When multiplying decimals, after multiplying the numbers as if they were whole numbers, you add the total number of decimal places in both factors. This sum determines how many places to move the decimal point to the left in the product to get the correct answer.

When Multiplying Decimal Numbers and You Have Multiplied the Numbers