Factors and Multiples - JSS1 Mathematics Past Questions and Answers - page 2

The prime factors of 48 are 2 × 2 × 2 × 2 × 3, or in index form, 2⁴ × 3.

Factors of 36: 1, 2, 3, 4, 6, 9, 12, 18, 36

Factors of 54: 1, 2, 3, 6, 9, 18, 27, 54

The highest common factor is 18.

Multiples of 15: 15, 30, 45, 60, ...

Multiples of 20: 20, 40, 60, 80, ...

The least common multiple is 60.

The smallest prime number greater than 20 is 23.