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
12
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? Now, change both fractions to make new equivalent fractions with the new common denominator (don't forget to change the numerator).
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? Now, change both fractions to make new equivalent fractions with the new common denominator (don't forget to change the numerator).
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