Estimating Decimals

1
Estimating Decimals
2
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
  

3
Rounding Jingle

• 4 and less let it rest,
• 5 and up bump it up

4
Guided Practice

• Round each decimal to the nearest whole number.
• 5.39
• 43.27
• 16.892
• 51.508
• 99.83

5
Guided Practice

• Round each decimal to the nearest tenth.
• 57.16
• 38.891
• 3.1974
• 17.753
• 29.987

6
Guided Practice

• Round each decimal to the nearest hundredths.
• 4.468
• 3.761
• 38.997

7
Guided Practice

• Estimate each sum or difference.
• 3.96 8.31
• 9.67 3.81
• 5.75 4.04
• 11.2 9.67

8
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

9
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

10
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

11
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