Multiplying Decimals Using Estimation

Front

What is estimation in multiplication?

Back

Estimation in multiplication is a method used to find an approximate answer by rounding numbers to make calculations easier.

Front

How do you round 12.3 to the nearest whole number?

Back

12.3 rounds to 12.

Front

How do you round 19.5 to the nearest whole number?

Back

19.5 rounds to 20.

Front

What is the estimated product of 12.3 and 19.5 using rounding?

Back

The estimated product is 12 x 20 = 240.

Front

What is the purpose of placing a decimal point in multiplication?

Back

Placing a decimal point correctly ensures the product reflects the value of the original numbers.

Front

When multiplying 15.22 by 7.3, how many decimal places are in the factors?

Back

There are three decimal places in total (2 from 15.22 and 1 from 7.3).

Front

How do you determine where to place the decimal point in a product?

Back

Count the total number of decimal places in the factors and place the decimal point in the product accordingly.

Front

What is the estimated product of 199.2 and 34 using rounding?

Back

The estimated product is 200 x 30 = 6000.

Front

How do you round 199.2 to the nearest hundred?

Back

199.2 rounds to 200.

Front

How do you round 34 to the nearest ten?

Back

34 rounds to 30.