Skip to the main content
PeabodyMake a free story

✖️ 4th grade math · Multiply & Divide

Factors, multiples and primes

A factor divides into a number exactly, with nothing left over. The factors of 12 are 1, 2, 3, 4, 6 and 12.

Worked example

Which one is a factor of 12?
Answer: 4
A factor divides in exactly, with nothing left over. 12 ÷ 4 = 3, so 4 is a factor. The factor pairs of 12 are 1 × 12, 2 × 6, 3 × 4.

For grown-ups: Factors, multiples, prime and composite (to 100). Below: three problems to try with the worked answers, and a free printable sheet. Children can practise the same skill as a game, with no sign-up and no ads.

  • CCSS 4.OA.B.4
What this practises, for teachers

Practices factors, multiples, prime and composite (to 100) (4.OA.B.4). A printable sheet with its answer key, worked answers on the page, no accounts.

▶ Practise it

For your class

🖨️ Printable sheet and key

On the board with this skill:

More printables, with answer keys, for this grade:

Try three

  1. Which one is a factor of 15?
    Show the answer and how
    Answer: 3
    A factor divides in exactly, with nothing left over. 15 ÷ 3 = 5, so 3 is a factor. The factor pairs of 15 are 1 × 15, 3 × 5.
  2. Which one is a factor of 16?
    Show the answer and how
    Answer: 8
    A factor divides in exactly, with nothing left over. 16 ÷ 8 = 2, so 8 is a factor. The factor pairs of 16 are 1 × 16, 2 × 8, 4 × 4.
  3. Which one is a factor of 56?
    Show the answer and how
    Answer: 7
    A factor divides in exactly, with nothing left over. 56 ÷ 7 = 8, so 7 is a factor. The factor pairs of 56 are 1 × 56, 2 × 28, 4 × 14, 7 × 8.

Before and after

Learn first: Leftovers in stories (4th)

Comes next: Make equivalent fractions (4th)

Name: ____________________Date: ____________Score: ____ / 12

Factors, multiples and primes (4th grade)

  1. Which one is a factor of 24?
  2. Which one is a factor of 20?
  3. Which one is a factor of 14?
  4. Which one is a factor of 14?
  5. Which one is a factor of 20?
  6. Which one is a factor of 15?
  7. Which one is a factor of 16?
  8. Which one is a factor of 28?
  9. Which one is a factor of 54?
  10. Which one is a factor of 32?
  11. Which one is a factor of 54?
  12. Which one is a factor of 60?

Answer key

  1. 6
  2. 5
  3. 7
  4. 7
  5. 5
  6. 5
  7. 8
  8. 2
  9. 18
  10. 8
  11. 6
  12. 5

More 4th grade skills: all 4th grade math skills, or every grade at math skills.