Factors and Multiples - JSS1 Mathematics Past Questions and Answers - page 2
11
Find the prime factors of 48.
The prime factors of 48 are 2 × 2 × 2 × 2 × 3, or in index form, 2⁴ × 3.
12
Calculate the HCF of 36 and 54.
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.
13
Determine the LCM of 15 and 20.
Multiples of 15: 15, 30, 45, 60, ...
Multiples of 20: 20, 40, 60, 80, ...
The least common multiple is 60.
14
What is the smallest prime number greater than 20?
The smallest prime number greater than 20 is 23.