Society & Culture & Entertainment Education

How to Multiply a Whole Number & a Decimal

    • 1). Multiply the whole number by the decimal number without regard to the placement of the decimal point. For example, consider 123 x 0.3.

    • 2). Remove the decimal point and perform the following multiplication problem: 123 x 3 = 369.

    • 3). Count the number of decimal places in each original factor (123 and 0.3) and add them up. Move the decimal point in the product, 369, to the left an equal number of places. In this case, the number of decimal places in the factor 123 is zero, and the number of decimal places in the factor 0.3 is one. Therefore, move the decimal point in the product, 369, one place to the left, yielding 36.9 as the answer.

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