Question

Which of the following pair of numbers have 5 as their common factor?

• A. 5, 24
• B. 13, 45
• C. 25, 45
• D. 9, 16

Answer 1

The correct option is C 25, 45

Factors of pair 1:
5: 1, and 5
24: 1, 2, 3, 4, 6, 8, 12, and 24
Common factor: 1

Factors of pair 2:
13: 1, and 13
45: 1, 3, 5, 9, 15, and 45
Common factor: 1

Factors of pair 3:
25: 1, 5, and 25
45: 1, 3, 5, 9, 15, and 45
Common factors: 1, and 5

Factors of pair 4:
9: 1, 3, and 9
16: 1, 2, 4, 8, and 16
Common factor: 1