7th Grade Factors, Multiples and Primes Worksheet — Level 2 — 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 2 — Practice Set 3 — Answers
Part A: Factors
1.List all the factors of 75.
Answer: 1, 3, 5, 15, 25, 75
2.List all the factors of 82.
Answer: 1, 2, 41, 82
3.List all the factors of 29.
Answer: 1, 29
4.List all the factors of 25.
Answer: 1, 5, 25
Part B: Multiples
5.Write the first five multiples of 9.
Answer: 9, 18, 27, 36, 45
6.Write the first five multiples of 10.
Answer: 10, 20, 30, 40, 50
7.Write the first five multiples of 6.
Answer: 6, 12, 18, 24, 30
8.Write the first five multiples of 3.
Answer: 3, 6, 9, 12, 15
Part C: HCF and LCM
9.Find the highest common factor (HCF) of 20 and 12.
Answer: 4
- Factors of 20: 1, 2, 4, 5, 10, 20
- Factors of 12: 1, 2, 3, 4, 6, 12
- Highest common factor = 4
10.Find the highest common factor (HCF) of 6 and 21.
Answer: 3
- Factors of 6: 1, 2, 3, 6
- Factors of 21: 1, 3, 7, 21
- Highest common factor = 3
11.Find the lowest common multiple (LCM) of 19 and 38.
Answer: 38
- Multiples of 19: 19, 38, 57, 76…
- Multiples of 38: 38, 76, 114, 152…
- Lowest common multiple = 38
12.Find the lowest common multiple (LCM) of 26 and 31.
Answer: 806
- Multiples of 26: 26, 52, 78, 104…
- Multiples of 31: 31, 62, 93, 124…
- Lowest common multiple = 806
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