Common Denominators and Fraction Operations

What is a common denominator?

• A fraction with a different numerator

• The highest value in a set of denominators

• A common denominator is a shared multiple of the denominators of two or more fractions.

• A whole number

Find the least common denominator for the fractions 1/3 and 2/5.

• 10

• 8

• 12

• 15

Add 1/4 and 3/8. What is the sum?

• 2/4

• 4/8

• 5/8

• 1/2

Subtract 2/5 from 3/7. What is the difference?

• -11/35

• 1/9

• -5/12

• -1/3

Simplify the fraction 4/6 after adding 1/3.

• 1

• 3/7

• 2/5

• 5/9

Identify the common denominator for the fractions 2/9 and 5/6.

• 10

• 27

• 18

• 14

What is the least common denominator for the fractions 3/4 and 5/6?

• 10

• 15

• 8

• 12

Add 2/5 and 3/10. What is the sum?

• 1/2

• 5/10

• 4/15

• 7/10

Subtract 1/3 from 5/8. What is the difference?

• 3/11

• 2/5

• 7/24

• 1/4

Simplify the fraction 7/12 after subtracting 1/6.

• 5/12

• 2/12

• 3/12

• 7/18