Add Fractions Common Denominator

What do you need to have when adding unlike fractions?

• common denominator

• common numerator

• common numerator and denominator

Which of these numbers could NOT be a common denominator for these two fractions?
2/4   and   3/8

• 32

• 12

• 8

• 24

Which of these numbers could NOT be a common denominator for these two fractions?
1/6   and   1/4

• 12

• 18

• 24

• 36

Which of these numbers could NOT be a common denominator for these three fractions?
1/3   and 2/5   and   3/10

• 15

• 30

• 60

• 90

What is the sum of these fractions in lowest terms?

• 5/12

• 5/24

• 6/12

• 6/144

What is the value of 3/20 + 3/4?

• 9/20

• 9/10

• 9/24

• 9/80

What number could be a common denominator for 1/5 and 5/6?

• 30

• 11

• 6

• 5

5/6 - 1/3 =

• 1/2

• 1/3

• 1/6

• 1/12

What is the sum of 3/10 and 3/5? 

• 8/10

• 9/10

• 7/10

• 11/10

4/9 + 1/3 =

• 5/12

• 7/9

• 1/9

• 5/9