Question

Which of the following is a factor pair of the number 20?

• A. $(4,6)$
• B. $(4,5)$
• C. $(3,7)$
• D. $(2,20)$

Answer 1

The correct option is B $(4,5)$

The factors of 20 are 1, 2, 4, 5, 10, 20 as follows:
1 × 20 = 20
2 × 10 = 20
4 × 5 = 20
From the given options, (4, 5) is the factor pair of 20.