estimating decimals
DESCRIPTION
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 = - PowerPoint PPT PresentationTRANSCRIPT
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