Finding the Lowest Common Denominator Worksheet Test
Instructions: For each question, select the correct answer or complete the blank space with the appropriate information.
Section 1: Multiple Choice

Which of the following is NOT a factor of 12?
 A) 1
 B) 2
 C) 3
 D) 4

What is the lowest common multiple of 4 and 6?
 A) 12
 B) 18
 C) 24
 D) 26

Which of the following is a common factor of 8 and 12?
 A) 2
 B) 3
 C) 4
 D) 5

What is the lowest common denominator of 2/3 and 3/4?
 A) 6
 B) 12
 C) 24
 D) 36

Which of the following is NOT a multiple of 5?
 A) 10
 B) 15
 C) 20
 D) 25
Section 2: Fill in the Blanks

The lowest common multiple of 3 and 7 is _____.

To add fractions with different denominators, you must first find the _____.

The lowest common denominator of 1/2 and 3/4 is _____.

The factors of 15 are and .

The lowest common multiple of 5 and 9 is _____.
Section 3: True or False

A multiple of a number is always greater than the number itself.
 A) True
 B) False

The lowest common multiple of two numbers is the smallest number that both numbers divide into evenly.
 A) True
 B) False

To find the lowest common denominator of two fractions, you must first find the lowest common multiple of the denominators.
 A) True
 B) False

The factors of a number are always greater than the number itself.
 A) True
 B) False

The lowest common denominator of two fractions is always the same as the lowest common multiple of the denominators.
 A) True
 B) False
Section 4: Short Answer

Explain why finding the lowest common denominator is important when adding or subtracting fractions.

What is the difference between a factor and a multiple?

List the first five multiples of 9.

What is the lowest common multiple of 2, 3, and 5?

How do you find the factors of a number?