Example 1 · level 1
Which of these is a factor of 30?
- 3
- 8
- 12
- 18
Show solution
- 30 ÷ 3 = 10 exactly, so 3 is a factor.
- Factors of 30: 1, 2, 3, 5, 6, 10, 15, 30.
Answer: 3
CLASS 4 MATHS · NUMBERS
Factors and multiples
A factor divides a number exactly. A multiple is the number times 1, 2, 3, …
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Worked examples
Example 2 · level 2
Which of these is a factor of 60?
- 17
- 8
- 13
- 4
Show solution
- 60 ÷ 4 = 15 exactly, so 4 is a factor.
- Factors of 60: 1, 2, 3, 4, 5, 6, 10, 12, 15, 20, 30, 60.
Answer: 4
Example 3 · level 3
Which of these is a factor of 42?
- 19
- 18
- 13
- 6
Show solution
- 42 ÷ 6 = 7 exactly, so 6 is a factor.
- Factors of 42: 1, 2, 3, 6, 7, 14, 21, 42.
Answer: 6