Estimating When Multiplying Decimals

8.898 x 9.1 = about 81

• Reasonable

• Not reasonable

6.162 x 9.898 = about 600

• Reasonable

• Not reasonable

2.4 x 12.7 = about 30

• Reasonable

• Not reasonable

5.12345 x 6.1345 = about 3

• Reasonable

• Not reasonable

To estimate the product of two mixed numbers, you should....

• Use a calculator to get the answer, then round it to the nearest whole number.

• Guess randomly

• Round each number to the nearest whole number, and multiply

0.12 x 0.345 = 4.14

• Reasonable

• Not reasonable

0.987 x 0.12 = 1.1844

• Reasonable

• Not reasonable

0.45 x 0.26 = 0.117

• Reasonable

• Not reasonable

0.99 x 0.77 = 0.76

• Reasonable

• Not Reasonable

A number less than one multiplied by another number less than one always gives a product that is....

• Less than one

• Greater than one

• It depends on the question