Common Denominators

Adding

Subtracting

Equivalent Fractions

Word Problems

100

What number that can be used as a common denominator to rewrite the fractions 1/3 & 2/4

12 or 24

100

3/5 + 2/10=

8/10 or 16/20

100

2/4- 1/8=

3/8

100

Write a pair of equivalent fractions

for 3/4 and 5/10 using a common denominator of 20.

15/10 & 10/20

100

Of the students in Maria’s class,4/5 have dogs and 7/10 have cats. No students have both a dog and a cat. What fraction represents how many more students in Maria’s class have dogs?

1/10 more dogs

200

What number that can be used as a common denominator to rewrite the fractions 1/8 & 2/11

88

200

12/15 - 4/30=

20/30 or 40/60

200

5/7 - 3/5=

4/35

200

Write a pair of equivalent fractions

for 1/4 and 2/8 using a common denominator of 16.

4/16 & 4/16

200

Katie spent 5/8 hour painting and

3/5 hour drawing. How much time did she spend painting and drawing

49/40

300

What number that can be used as a common denominator to rewrite the fractions 1/12 & 2/11

132

300

8/9 + 2/3=

34/27 or 1 7/27

300

7/6- 4/12

10/12 or 20/24 or 26/36

300

Write a pair of equivalent fractions

for 2/4 and 2/6 using a common denominator of 48.

24/48 & 16/48

300

Mrs. Zuniga reads for 4/5 of an hour and Mr. Stotzer reads 1/7 of an hour. How much more time did Mrs. Zuniga read?

23/35 hours more

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