Rounding and Estimation with Decimals

Estimating is to....

• find the exact answer

• find something close to the correct answer

• use an algorithm

a method for estimating a number in which the first digit of a number is retained and all remaining digits are changed to zero

• fluency

• factor

• front-end method

• false

Round 5.67 to the nearest whole number for estimation.

• 6

• 8

• 7

• 5

Which of the following is the best estimate for the equation:

70.2-59.7

• 25

• 10

• 3

• 19

Which of the following is the best estimate for the equation:

15.9 + 12.03

• 28

• 15

• 37

• 18

Which of the following is the best estimate for the equation:

61.44 + 88.3

• 100

• 120

• 150

• 200

Estimate the sum by rounding each decimal to the nearest hundred.

428.1 + 186.5

• 500

• 600

• 700

• 800

Estimate the difference by rounding each decimal to the nearest ten. 17.52 - 12.03

• 12

• 11

• 15

• 10

Estimate the difference by rounding each decimal to the nearest hundred.

376.8 - 109.5

• 100

• 200

• 300

• 400

Round each decimal to the nearest whole number. Then add or subtract.

19.83 + 9.93