Transcript Estimating Decimals

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