Estimating Decimals

Rounding Rules

The digit to the right is greater or equal to 5, round up

The digit to the right is less than 5, round down

Rounding Jingle

4 and less let it rest,

5 and up bump it up

Guided Practice

Round each decimal to the nearest whole number.

5.39 =

43.27 =

16.892 =

51.508 =

99.83 =

Guided Practice

Round each decimal to the nearest tenth.

57.16 =

38.891 =

3.1974 =

17.753 =

29.987 =

Guided Practice

Round each decimal to the nearest hundredths.

4.468 =

3.761 =

38.997 =

Guided Practice

Estimate each sum or difference.

3.96 + 8.31 =

9.67 – 3.81 =

5.75 + 4.04 =

11.2 – 9.67 =

Problem Solving

Camera film costs $3.99 a roll. Wes needs 3 rolls to take pictures of the class party. He has $15. Does he have enough money?

Yes

Problem Solving

Flowers cost $5.99 a dozen. Faye wants to buy 2 dozen flowers. She also wants to buy a balloon that cost $4.50. Faye has $20. Does Faye have enough money to buy everything she wants?

Yes

Problem Solving

Eric bought pretzels for $1.89, peanuts for $2.39, and popcorn for $0.99. How much did he spend in all?

Answer: $5.27

Problem Solving

A party is scheduled to last one hour. Mrs. Call wants to show a video that lasts between 10 to 15 minutes. About how much time will be left for other activities?

Answer: about 45-50 minutes