Common Denominators

What is the least common denominator of 1/2 and 3/7?

• 2
• 14
• 7
• 28

What is the least common denominator of 1/9 and 2/3?

• 6
• 3
• 9
• 21

What is the least common denominator of 2/4 and 4/7?

• 24
• 7
• 42
• 28

What is the least common denominator of 2/6 and 7/8?

• 36
• 8
• 18
• 24

What is the least common denominator for 1/4 + 4/6

• 12
• 6
• 24
• 4

What is the least common denominator for 3/8 - 1/12

• 12
• 24
• 8
• 96

What is the least common denominator for 1/3 + 1/2 + 1/4

• 8
• 6
• 9
• 12

Find the LCM for the following fractions: 
1/2     and   1/3

• 2
• 3
• 4
• 6

Find the LCM for the following fractions: 
1/15     and   1/10

• 10
• 15
• 20
• 30

What must you have to add and subtract fractions?

• common numerators
• different denominators
• different numerators
• common denominators