Grade 6 · Math · Unit 2 of 13
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.
Nunavut Curriculum approved guide: Alberta Mathematics K–9 (2007), Number · factors and multiples, prime and composite numbers
Sample questions
A taste of this unit. In the app, questions change every time and get easier or harder to match your child.
Question 1
Which of these numbers is prime?
- 27
- 51
- 33
- 53
53
Hint: A prime number has exactly two factors: 1 and itself. Test each number by dividing by 2, 3, 5 and 7. For example, 51 = 3 × 17, so 51 is not prime.
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
7
Hint: Identical bags with nothing left over means the number of bags must divide both 35 and 49. Find the greatest common factor.
Question 3
What is 20 ÷ 4?
20 ÷ 4 = ?
answer box
5
Hint: Think multiplication: 4 × ? = 20. Which fact do you know?
Question 4
What number goes in the box?
8 × = 56
- 9
- 6
- 7
- 8
7
Hint: Divide to find a missing factor: 56 ÷ 8.
Question 5
Which number is a multiple of 9?
- 53
- 52
- 54
- 55
54
Hint: A multiple of 9 is in the 9 times table: 9 × 1, 9 × 2, 9 × 3, and so on. Check which choice divides by 9 with nothing left over.
Question 6
What is the greatest common factor (GCF) of 32 and 24?
answer box
8
Hint: List the factors of each number. The GCF is the biggest number that appears in both lists.