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Prime Factors Worksheet

A Grade 6 math worksheet on prime factorization, including identifying prime numbers, factor trees, and writing prime factorizations.

Grade 6 Math Number SensePrime Factors
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Includes

Multiple ChoiceFill in the Blanks2 Short Answer

Standards

CCSS.MATH.CONTENT.6.NS.B.4

Topics

mathprime factorsfactorizationgrade 6
6 sections · Free to use · Printable
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Prime Factors Worksheet

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Read each question carefully and answer to the best of your ability. Show all your work for factor tree problems.

1. Which of the following numbers is a prime number?

a

9

b

15

c

19

d

21

2. Which of the following numbers is NOT a prime number?

a

2

b

7

c

11

d

12

3. A prime number is a natural number greater than 1 that has no positive divisors other than 1 and  .

4. The number 1 is neither prime nor  .

5. A   number is a natural number that can be formed by multiplying two smaller natural numbers.

6. Draw a factor tree for the number 24.

7. Draw a factor tree for the number 36.

8. Write the prime factorization of 40.

9. Write the prime factorization of 60.