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These grade 6 prime factorization worksheets are made for Grade 6 learners, with four difficulty levels so you can match the practice to the child.

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Grade 6 Prime factorization Worksheets

Grade 6 practice: Write a whole number as a product of its prime factors. Choose a level below to generate a fresh set of questions.

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Understanding prime factorization

Prime factorisation writes a whole number as a product of only prime numbers, showing the unique set of primes that build it. In Grade 6 learners factor a number down to its primes, often using a factor tree. This representation is the key to finding greatest common factors, least common multiples, and simplifying fractions efficiently.

For example, 60 = 2 × 2 × 3 × 5, usually written 2² × 3 × 5. A common mistake is to stop before every factor is prime, leaving a composite such as 4 or 6 in the product. A helpful tip is to keep splitting each branch of the factor tree until every leaf is a prime, then collect the primes; checking that multiplying them all back together returns the original number confirms the factorisation is complete.

Sample prime factorization questions

These examples come from the Easy setting. Generate a worksheet for a complete page with space for working.

Write the prime factorization of 35.
Write the prime factorization of 77.
Write the prime factorization of 121.
Write the prime factorization of 33.

Check the sample answers

5 × 7
7 × 11
11 × 11
3 × 11

Practice focus

Write a whole number as a product of its prime factors. Show each step and check the answer.

Grade 6 Prime factorization Worksheets

Understanding prime factorization

Sample prime factorization questions

Practice focus

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