7th Grade Factors, Multiples and Primes Worksheet — Level 3 — Practice Set 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 — Practice Set 3 — Answers
Part A: Factors
1.List all the factors of 68.
Answer: 1, 2, 4, 17, 34, 68
2.List all the factors of 48.
Answer: 1, 2, 3, 4, 6, 8, 12, 16, 24, 48
3.List all the factors of 14.
Answer: 1, 2, 7, 14
4.List all the factors of 39.
Answer: 1, 3, 13, 39
Part B: Multiples
5.Write the first five multiples of 11.
Answer: 11, 22, 33, 44, 55
6.Write the first five multiples of 5.
Answer: 5, 10, 15, 20, 25
7.Write the first five multiples of 3.
Answer: 3, 6, 9, 12, 15
8.Write the first five multiples of 10.
Answer: 10, 20, 30, 40, 50
Part C: HCF and LCM
9.Find the highest common factor (HCF) of 20 and 13.
Answer: 1
- Factors of 20: 1, 2, 4, 5, 10, 20
- Factors of 13: 1, 13
- Highest common factor = 1
10.Find the lowest common multiple (LCM) of 30 and 28.
Answer: 420
- Multiples of 30: 30, 60, 90, 120…
- Multiples of 28: 28, 56, 84, 112…
- Lowest common multiple = 420
11.Find the highest common factor (HCF) of 25 and 37.
Answer: 1
- Factors of 25: 1, 5, 25
- Factors of 37: 1, 37
- Highest common factor = 1
12.Find the highest common factor (HCF) of 16 and 6.
Answer: 2
- Factors of 16: 1, 2, 4, 8, 16
- Factors of 6: 1, 2, 3, 6
- Highest common factor = 2
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