7th Grade Factors, Multiples and Primes Worksheet — Level 3 — Answers
Answer sheet with worked solutions for the 7th Grade factors, multiples & primes worksheet.
Success TutoringWorksheetsAnswer sheet7th Grade · Mathematics · Factors, Multiples & Primes7th Grade Factors, Multiples and Primes Worksheet — Level 3 — Answers
Part A: Factors
1.List all the factors of 60.
Answer: 1, 2, 3, 4, 5, 6, 10, 12, 15, 20, 30, 60
2.List all the factors of 57.
Answer: 1, 3, 19, 57
3.List all the factors of 53.
Answer: 1, 53
4.List all the factors of 17.
Answer: 1, 17
Part B: Multiples
5.Write the first five multiples of 10.
Answer: 10, 20, 30, 40, 50
6.Write the first five multiples of 3.
Answer: 3, 6, 9, 12, 15
7.Write the first five multiples of 8.
Answer: 8, 16, 24, 32, 40
8.Write the first five multiples of 9.
Answer: 9, 18, 27, 36, 45
Part C: HCF and LCM
9.Find the highest common factor (HCF) of 21 and 26.
Answer: 1
- Factors of 21: 1, 3, 7, 21
- Factors of 26: 1, 2, 13, 26
- Highest common factor = 1
10.Find the highest common factor (HCF) of 31 and 39.
Answer: 1
- Factors of 31: 1, 31
- Factors of 39: 1, 3, 13, 39
- Highest common factor = 1
11.Find the lowest common multiple (LCM) of 7 and 38.
Answer: 266
- Multiples of 7: 7, 14, 21, 28…
- Multiples of 38: 38, 76, 114, 152…
- Lowest common multiple = 266
12.Find the lowest common multiple (LCM) of 18 and 28.
Answer: 252
- Multiples of 18: 18, 36, 54, 72…
- Multiples of 28: 28, 56, 84, 112…
- Lowest common multiple = 252
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.