# Finding Common Denominators Worksheet Test

Answer the following questions by finding the common denominators.

- Find the common denominator for 2/5 and 1/3.
- What is the common denominator for 3/4 and 5/6?
- Find the least common denominator for 1/2, 3/4, and 2/3.
- What is the common denominator for 1/2, 1/3, and 1/4?
- Find the least common denominator for 2/3, 7/8, and 5/6.
- What is the common denominator for 1/6 and 3/8?
- Find the least common denominator for 3/5, 2/3, and 4/7.
- What is the common denominator for 1/5 and 2/3?
- Find the least common denominator for 1/2, 1/3, 1/4, and 1/6.
- What is the common denominator for 3/7 and 4/9?

Complete the following problems by finding the missing numerator or denominator.

- 1/6 + __/18 = 5/9
- 3/4 – __/8 = 5/16
- __/12 + 5/6 = 7/4
- __/15 – 1/5 = 1/3
- 1/__ + 1/10 = 3/20

Solve the following problems by finding the common denominator and adding or subtracting.

- 2/5 + 1/3 =
- 5/6 – 3/4 =
- 1/2 + 3/4 + 2/3 =
- 1/3 – 1/4 + 2/5 =
- 2/3 + 7/8 – 5/6 =

Simplify the following fractions by finding the common denominator.

- 4/5 + 3/5 =
- 2/3 + 1/6 =
- 1/4 + 3/8 =
- 2/5 + 7/10 =
- 3/7 – 2/7 =

Convert the following mixed numbers into improper fractions and find the common denominator.

- 2 1/3 + 1 1/2 =
- 3 2/5 – 1 1/10 =
- 4 1/6 + 2 1/3 – 3 3/4 =
- 2 1/2 – 1 1/4 =
- 3 3/4 + 1 2/3 =

Good Luck!