Adding & Subtracting Fractions
3/8 + 3/4
9/8 = 1 1/8
5 9/10 - 3 2/5 =
2 1/2
Use benchmarks to find an estimate.
4/6 + 1/8 =
1/2 + 0 = 1/2
Find the least common denominator and find an equivalent fractions.
5/12 & 2/9
15/36 & 8/36
Rule: start at 2 1/3, add 2 1/4
2 1/3, 4 7/12, 6 5/6, 9 1/12
5/6 - 1/3
3/6 = 1/2
1 9/10 + 1 4/15
3 1/6
Use benchmarks to find an estimate.
2/6 + 7/8 =
1/2 + 1 = 1 1/2
Find the least common denominator and find an equivalent fractions.
3/4 & 9/10
15/20 & 18/20
What is the sum of 2 1/3, 3 5/6, and 6 2/3?
12 5/6
Kayla mixed two liquids for a science experiment. One container held 7/8-cup and the other held 9/10 cup. What is the total amount of the mixture?
1 31/40 cups
At the deli, Ricky ordered 3 1/5 pounds of cheddar cheese and 2 3/4 pounds of mozzarella cheese. How many pounds of cheese did he order all together?
5 19/20 pounds of cheese
Use benchmarks to find an estimate.
7/8 - 5/6 =
1 - 1 = 0
Ella spends 2/3 hour practicing the piano each day. She also spends 1/2 hour jogging. What is the least common denominator of the fractions?
6
Laura bought a tree seedling that was 2 1/4 feet tall. During the first year, it grew 1 1/6 feet. After two years, it was 5 feet tall. How much did the seedling grow during the second year?
1 7/12 feet
Lisa bought 3/8 pound of red grapes and 5/12 pound of green grapes. How many pounds of grapes did he buy?
19/24 pound of grapes
Archie has a goal to job 4 1/2 miles each day. On Monday, he jogged 5 9/16 miles. By how much did he exceed his goal for that day?
1 1/16 miles
Use benchmarks to find an estimate.
Tyler had 2 7/16 yards of fabric. He used 3/4 yard to make a vest. About how much fabric did he have left?
About 1 1/2 yard.
(2 1/2 - 1)
Joe says that there is 5/8 of a ham sandwich left and 1/2 of a turkey sandwich left. What is a pair of equivalent fractions for 5/8 and 1/2?
Possible answer:
15/24 and 12/24
11 3/4 miles
Jake had a 7/8-foot board. He cut off a 1/4-foot piece that was for a project. In feet, how much of the board was left?
5/8-foot of the board.
16 3/8 - 9 5/8 =
6 3/4
Keith bought a package with 2 9/16 pounds of ground meat to make hamburgers. He has 2/5 pound of ground meat left. About how many pounds of ground meat did he use for the hamburgers?
(Use benchmarks).
about 2 pounds
(2 1/2 - 1/2)
Name a pair of fractions that use the least common denominator and are equivalent to 9/10 and 5/6.
27/30 and 25/30
Paula spent 3/8 of her allowance on clothes and 1/6 on entertainment. What fraction of her allowance did she spend on other times?
11/24