Year 5 Factors, Multiples and Primes Worksheet — Level 1 — Practice Set 4 — Answers
Answer sheet with worked solutions for the Year 5 factors, multiples & primes worksheet.
Success TutoringWorksheetsAnswer sheetYear 5 · Mathematics · Factors, Multiples & PrimesYear 5 Factors, Multiples and Primes Worksheet — Level 1 — Practice Set 4 — Answers
Part A: Factors
1.List all the factors of 18.
Answer: 1, 2, 3, 6, 9, 18
2.List all the factors of 24.
Answer: 1, 2, 3, 4, 6, 8, 12, 24
3.List all the factors of 21.
Answer: 1, 3, 7, 21
4.List all the factors of 20.
Answer: 1, 2, 4, 5, 10, 20
Part B: Multiples
5.Write the first five multiples of 6.
Answer: 6, 12, 18, 24, 30
6.Write the first five multiples of 9.
Answer: 9, 18, 27, 36, 45
7.Write the first five multiples of 5.
Answer: 5, 10, 15, 20, 25
8.Write the first five multiples of 4.
Answer: 4, 8, 12, 16, 20
Part C: Prime or not?
9.5 is a prime number.
Answer: True
5 has only two factors: 1 and 5.
10.15 is a prime number.
Answer: False
15 = 3 × 5, so it is composite.
11.39 is a prime number.
Answer: False
39 = 3 × 13, so it is composite.
12.24 is a prime number.
Answer: False
24 = 2 × 12, so it is composite.
Marking tips
- Give credit for correct method even when the final answer slips — the working shows where the thinking went right.
- For open-ended tasks, use the success criteria as a checklist rather than looking for one "right" answer.
- Celebrate what went well first, then pick one thing to work on next.