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Grade 6 · Math · Unit 3 of 18

Facts & Factors

Facts, primes, GCF and LCM

What your child practises

Quick recall of multiplication and division facts, plus factors, multiples and prime numbers, the greatest common factor (GCF) and least common multiple (LCM), and word problems that use them.

Prince Edward Island Curriculum curriculum outcome: N3 · factors, multiples, prime and composite numbers, and common factors and multiples

How we explain it

Children can open this short lesson before they practise.

  1. A factor divides a number evenly. 3 and 4 are factors of 12.
  2. The greatest common factor (GCF) is the biggest factor two numbers share.
  3. The least common multiple (LCM) is the smallest multiple they share.

Example: Find the GCF of 12 and 18. Factors of 12: 1, 2, 3, 4, 6, 12. Factors of 18: 1, 2, 3, 6, 9, 18. The biggest shared one is 6. Answer: 6

Sample questions

A taste of this unit. In the app, questions change every time and get easier or harder to match your child.

  1. Question 1

    Which of these numbers is prime?

    • 27
    • 51
    • 33
    • 53

  2. Question 2

    Zoe has 35 apples and 49 oranges. Zoe wants to pack them into identical bags with nothing left over. What is the greatest number of bags Zoe can make?

    • 35
    • 5
    • 6
    • 7

  3. Question 3

    What is 20 ÷ 4?

    20 ÷ 4 = ?

    answer box

  4. Question 4

    What number goes in the box?

    8 × = 56

    • 9
    • 6
    • 7
    • 8

  5. Question 5

    Which number is a multiple of 9?

    • 53
    • 52
    • 54
    • 55

  6. Question 6

    What is the greatest common factor (GCF) of 32 and 24?

    answer box

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