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

1. Which of the following is NOT a factor of 12?

   • A) 1
   • B) 2
   • C) 3
   • D) 4

2. What is the lowest common multiple of 4 and 6?

   • A) 12
   • B) 18
   • C) 24
   • D) 26

3. Which of the following is a common factor of 8 and 12?

   • A) 2
   • B) 3
   • C) 4
   • D) 5

4. What is the lowest common denominator of 2/3 and 3/4?

   • A) 6
   • B) 12
   • C) 24
   • D) 36

5. Which of the following is NOT a multiple of 5?

   • A) 10
   • B) 15
   • C) 20
   • D) 25

Section 2: Fill in the Blanks

1. The lowest common multiple of 3 and 7 is _____.

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

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

4. The factors of 15 are and .

5. The lowest common multiple of 5 and 9 is _____.

Section 3: True or False

1. A multiple of a number is always greater than the number itself.

   • A) True
   • B) False

2. The lowest common multiple of two numbers is the smallest number that both numbers divide into evenly.

   • A) True
   • B) False

3. To find the lowest common denominator of two fractions, you must first find the lowest common multiple of the denominators.

   • A) True
   • B) False

4. The factors of a number are always greater than the number itself.

   • A) True
   • B) False

5. 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

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

2. What is the difference between a factor and a multiple?

3. List the first five multiples of 9.

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

5. How do you find the factors of a number?