Common Denominators
What is the least common denominator of the following fractions?
3/10 and 9/8
40
Add. Simplify if needed.
5/12 + 1/4 =
8/12 = 2/3
Subtract. Simplify if necessary.
3/4 - 5/12=
1/3
Add. Simplify if necessary.
3 1/4 + 1 5/6=
5 1/12
Subtract. Simplify if necessary.
8 1/5 - 6 2/3=
1 8/15
What is the least common denominator of the following fractions?
5/12 and 3/5
60
Add. Simplify if necessary.
1/6 + 5/8 =
19/24
Subtract. Simplify if necessary.
7/8 - 2/3=
5/24
Add. Simplify if necessary.
5 1/2 + 2 1/8=
7 5/8
Subtract. Simplify if necessary.
4 1/5 - 7/10=
3 5/10 = 3 1/2
What is the least common denominator of the following fractions?
7/12 and 5/6
72
Sandra drove for 1/3 hour to get to the store. Then she drove 1/5 hour to get to the library. What fraction of an hour did she drive in all?
8/15
Subtract. Simplify if necessary.
5/8- 1/6=
11/24
Add. Simplify if necessary.
1 8/10 + 2 3/5=
3 7/5= 4 2/5
Marie needs 2 1/4 yards of fabric. She already has 1 3/8 yards. How many more yards of fabric does she need?
7/8 yard
What is the least common denominator of the following fractions? What are the new equivalent fractions with the new common denominator?
5/6 and 8/21
42
35/42
16/42
Add. Simplify if necessary.
1/4 + 11/12
1 1/6
Johnny ran 1/2 of a mile. Andrea ran 2/5 of a mile. How many more miles did Johnny run than Andrea?
1/10 mile
Justin jogs 3 2/5 miles every morning. He jogs 4 6/10 miles every evening. How many miles does he job every day?
8 miles
Mona bought 3 3/8 pounds of cheddar cheese. She used 2 3/4 pounds to make sandwiches. How much cheese is left?
5/8 cheese is left
What is the least common denominator of the following fractions? What are the new equivalent fractions with the new common denominator?
9/15 and 4/9
45
27/45
20/45
Peter watched 1/4 of TV on Monday, 3/8 of TV on Tuesday, and 3/4 of TV on Wednesday. How much TV did he watch in all?
11/8 = 1 3/8
Eva had 7/8 gallon of paint. Her brother Ivan used 1/4 gallon to paint his model boat. How much paint of left?
5/8 gallon of paint.
Mia planted a tree years ago. The first couple years the tree grew 5 11/12 feet tall. Last year the tree grew 1 3/4 feet tall. How many feet did the tree grow altogether?
7 2/3 feet tall
Gilberto worked 3 1/4 hours on Thursday, 4 2/5 on Friday, and 6 1/2 hours on Saturday. How many hours did he work in all during the three days?
14 3/20 hours