4th grade factors, multiples and primes

Grades 3–5 (ages 8–11) · 17 videos · Checked and refreshed daily

Quick answer

In 4th grade (ages 9–10), children find factor pairs for numbers up to 100, list multiples and sort numbers into prime and composite. Start with Math with Mr. J "Multiples vs. Factors" and Math Antics "Factoring", then sing the Numberock prime numbers song. Play all on repeat, or loop one lesson.

Play all on repeat

Videos in this playlist

  1. 1Multiples vs. Factors | What are Multiples and Factors? | Math with Mr. JMultiples vs. Factors | What are Multiples and Factors? | Math with Mr. JMath with Mr. JPlay from here Loop
  2. 2Math Antics - FactoringMath Antics - FactoringmathanticsPlay from here Loop
  3. 3What are Prime Numbers? | Math with Mr. JWhat are Prime Numbers? | Math with Mr. JMath with Mr. JPlay from here Loop
  4. 4Prime and Composite Numbers | Math with Mr. JPrime and Composite Numbers | Math with Mr. JMath with Mr. JPlay from here Loop
  5. 5Prime Numbers Song: Prime, Composite and SquarePrime Numbers Song: Prime, Composite and SquareNumberockPlay from here Loop
  6. 6Multiples | Common Multiples | Least Common Multiple (LCM) | Math with Mr. JMultiples | Common Multiples | Least Common Multiple (LCM) | Math with Mr. JMath with Mr. JPlay from here Loop
  7. 7Multiples of 2 | Math with Mr. JMultiples of 2 | Math with Mr. JMath with Mr. JPlay from here Loop
  8. 8Multiples of 3 | Math with Mr. JMultiples of 3 | Math with Mr. JMath with Mr. JPlay from here Loop
  9. 9Multiples of 4 | Math with Mr. JMultiples of 4 | Math with Mr. JMath with Mr. JPlay from here Loop
  10. 10Multiples of 6 | Math with Mr. JMultiples of 6 | Math with Mr. JMath with Mr. JPlay from here Loop
  11. 11Multiples of 7 | Math with Mr. JMultiples of 7 | Math with Mr. JMath with Mr. JPlay from here Loop
  12. 12Multiples of 8 | Math with Mr. JMultiples of 8 | Math with Mr. JMath with Mr. JPlay from here Loop
  13. 13Multiples of 9 | Math with Mr. JMultiples of 9 | Math with Mr. JMath with Mr. JPlay from here Loop
  14. 14Skip Counting by 5 Song | Multiples of 5Skip Counting by 5 Song | Multiples of 5NumberockPlay from here Loop
  15. 15Skip Counting by 9 Song | Counting Up by Multiples of 9Skip Counting by 9 Song | Counting Up by Multiples of 9NumberockPlay from here Loop
  16. 1611 Times Table Song | Skip Counting the Multiples of 1111 Times Table Song | Skip Counting the Multiples of 11NumberockPlay from here Loop
  17. 17Math Antics - Prime FactorizationMath Antics - Prime FactorizationmathanticsPlay from here Loop

What does this 4th grade factors and multiples unit cover?

It introduces factors and multiples and how they differ, how to find every factor pair of a number, and how to tell prime numbers from composite numbers. By the end a child should list the factors of 36 and say whether 29 is prime.

How does RepeatWatch help with factors and multiples?

Use Repeat one on a Numberock skip counting song to learn multiples by ear, or loop one Math with Mr. J example from A to B. Save the factor and prime sections on keys 1–9, and slow to 0.75× when listing factor pairs.

Frequently asked questions

What grade learns prime and composite numbers?

In the US, factor pairs, multiples and prime and composite numbers up to 100 are usually taught in 4th grade (ages 9–10). Prime factorization often comes in 6th grade. Grade levels vary by country and school.

Why is the multiples of 2 to 9 practice here?

Finding factors and multiples depends on knowing multiplication facts. The short Math with Mr. J multiples videos are quick daily practice. Watch one or two, then stop after N loops and try listing multiples on paper.