Year 7 Factors, Multiples and Primes Worksheet — Level 3 — Answers
Answer sheet with worked solutions for the Year 7 factors, multiples & primes worksheet.
Year 7 · Mathematics · Factors, Multiples & Primes
Year 7 Factors, Multiples and Primes Worksheet — Level 3 — Answers
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Part A — Factors
1.List all the factors of 51.
Answer: 1, 3, 17, 51
2.List all the factors of 38.
Answer: 1, 2, 19, 38
3.List all the factors of 66.
Answer: 1, 2, 3, 6, 11, 22, 33, 66
4.List all the factors of 39.
Answer: 1, 3, 13, 39
Part B — Multiples
5.Write the first five multiples of 4.
Answer: 4, 8, 12, 16, 20
6.Write the first five multiples of 5.
Answer: 5, 10, 15, 20, 25
7.Write the first five multiples of 7.
Answer: 7, 14, 21, 28, 35
8.Write the first five multiples of 12.
Answer: 12, 24, 36, 48, 60
Part C — HCF and LCM
9.Find the lowest common multiple (LCM) of 35 and 29.
Answer: 1015
- Multiples of 35: 35, 70, 105, 140…
- Multiples of 29: 29, 58, 87, 116…
- Lowest common multiple = 1015
10.Find the lowest common multiple (LCM) of 19 and 31.
Answer: 589
- Multiples of 19: 19, 38, 57, 76…
- Multiples of 31: 31, 62, 93, 124…
- Lowest common multiple = 589
11.Find the highest common factor (HCF) of 19 and 28.
Answer: 1
- Factors of 19: 1, 19
- Factors of 28: 1, 2, 4, 7, 14, 28
- Highest common factor = 1
12.Find the highest common factor (HCF) of 37 and 34.
Answer: 1
- Factors of 37: 1, 37
- Factors of 34: 1, 2, 17, 34
- Highest common factor = 1
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