Fractions Review with Adding and Subtracting

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

• 30
• 11
• 6
• 5

What number could be a common denominator for these three fractions?
1/2   and   1/3   and   1/4

• 9
• 8
• 12
• 6

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

Fill in the blank in order to create a true number sentence:
1/2 = __ /8

• 2
• 4
• 6
• 8

3/4 + 2/8 = 

• 1
• 5/12
• 6/32
• 5/8

5/7 + 1/28 = 

• 6/35
• 12/196
• 21/28
• 1

1/2 + 1/3 + 1/5 = 

• 31/30
• 3/10
• 1/30
• These fractions cannot be added

4/5 - 1/20 = 

• 0
• 20/15
• 3/15
• 15/20

93/100 - 4/5 = 

• 1/2
• 13/100
• 89/95
• 89/100