Mathematics for IGCSE & O level - Number (Section 1 - No. 5)

What are the prime factors of 42?

2, 3, 7

2, 3, 5

6, 7

1, 2, 3, 7

The prime factors of 42 are the prime numbers that divide 42 without leaving a remainder. 42 = 2 x 3 x 7.