Estimating Decimals

Front

What is a decimal?

Back

A decimal is a number that includes a decimal point, which separates the whole number part from the fractional part.

Front

How do you estimate the product of two decimals?

Back

To estimate the product, round each decimal to the nearest whole number and then multiply the rounded numbers.

Front

Estimate 3.7 x 0.43 by rounding.

Back

Round 3.7 to 4 and 0.43 to 0.4. Then, estimate: 4 x 0.4 = 1.6.

Front

What is the product of 19.9 and 0.87?

Back

The exact product is 17.313.

Front

How do you multiply decimals?

Back

Multiply as if they are whole numbers, then count the total number of decimal places in both factors and place the decimal in the product accordingly.

Front

Estimate 0.29 x 5.7 by rounding.

Back

Round 0.29 to 0.3 and 5.7 to 6. Then, estimate: 0.3 x 6 = 1.8.

Front

What is the total distance Jackie rode if the trail is 8.54 miles long and she rode around it 4 times?

Back

Total distance = 8.54 miles x 4 = 34.16 miles.

Front

What is the product of 9.2 and 6.4?

Back

The exact product is 58.88.

Front

What does it mean to round a decimal?

Back

Rounding a decimal means adjusting its value to make it simpler while keeping it close to the original value.

Front

How do you round 3.7 to the nearest whole number?

Back

3.7 rounds to 4 because it is closer to 4 than to 3.