Multiply with Decimals

SWBAT multiply decimals by whole numbers; multiply decimals by decimals

To multiply by decimals

1. Multiply as you would with whole numbers

2. Count the number of decimal places in both factors.

3. Mark off the same number of decimal places in the product.

Where would the decimal go?

5.9 0.235 9.27 12.92

x 3 x 7 x 1.5 x 0.7

177 1645 13905 9044. . . .

Examples

0.9 x 22 0.7 x 79 0.59 x 43 0.47 x 21 0.911 x 9.11 0.414 x 0.72 $8.05 x 1.9

Which costs more, 7 lbs of beef at $3.25 per pound or 12 lbs of chicken at $1.79 per pound? How much more?