Factor Tree Fun

A Grade 5 math worksheet focusing on factor trees to find prime factorization.

Grade 5 Math Number SenseFactor Trees

Use This Worksheet

Includes

2 Short AnswerFill in the BlanksMultiple ChoiceTrue / False

Standards

CCSS.MATH.CONTENT.4.OA.B.4

Topics

mathgrade 5factor treesprime factorization

7 sections · Free to use · Printable

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Factor Tree Fun

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A factor tree helps us find the prime factors of a number. Break down each number into its factors until all branches end in prime numbers. Remember, a prime number is a whole number greater than 1 that has only two factors: 1 and itself.

1. Complete the factor tree for the number 24. Write the prime factorization in the blank space.

Prime factorization of 24:

2. Complete the factor tree for the number 36. Write the prime factorization in the blank space.

Prime factorization of 36:

Identify the prime factors for each number using a factor tree in your head or on scratch paper.

3. The prime factors of 18 are .

4. The prime factors of 40 are .

5. The prime factors of 50 are .

6. Which of the following is the prime factorization of 60?

2 x 2 x 3 x 5

2 x 3 x 10

6 x 10

3 x 4 x 5

7. What are the prime factors of 72?

2, 3, 4, 6

2, 3

2, 2, 2, 3, 3

8, 9

Read each statement and circle True or False.

8. The number 1 is a prime factor.

True

False

9. Every composite number can be written as a product of prime factors.

True

False

10. Draw a factor tree for the number 48 in the space below. Then write its prime factorization.

Prime factorization of 48: