# Multiply

### Multiplying Decimals by 10, 100, 1000

To multiply a decimal number by a whole number

Ignore the decimal point and multiply the digits. Place the decimal point in the answer so that it has the same number of decimal places as the number being multiplied

Ex:   2.22 X 43 = 95.46 ### DE36    Multiply_Decimal_x_Whole

Multiply Decimals by powers of ten

0.5 x 10 = 5

0.5 x 100 = 50

0.5 x 1000 = 500

0.5 x 10000 = 5000

Hint: Just move the decimal point one place to the right for each zero you see after the 1

To multiply a decimal by a power of ten, just move the decimal point to the right as many times as there are 0’s.   (Add 0’s if there are not enough digits).

To multiply a decimal number by a decimal number

Ignore the decimal points and multiply the digits;   count the total number of decimal places in both decimal numbers being multiplied, and place a decimal point in the answer so that it has the same number of decimal places as the total number of decimal places in the two numbers being multiplied. ### CM14   Math_at_Dinner 