HCF and LCM

Calculate the difference between the highest and the lowest common factors for 9, 18 and 27.

(List out all of the factors and CF. Ex: 6: 1, 2, 3, 6)

Find the prime factors of 294.

Determine whether 4 is a common factor for 16, 36 and 58.

• Yes. 4 is a common factor for 16, 36 and 58.

• 4 is a common factor for 16 and 36 but 4 is not a common factor for 58.

• No. 4 is not a common factor for 16, 36 and 58.

Tick if the number in the brackets is a common multiple of the following numbers.

• 28, 56 (112)

• 17, 28, 68 (544)

• 6, 18, 21, 63 (126)

List the first four common multiples of 2, 4 and 9.

41, 43, 47, 53, ..., 89

Based on the numbers above, list the numbers that are missing between 53 and 89 and state the type of number.

In a Taman Desa gotong royong campaign, the village chief has prepared 48 garbage bags, 96 brooms and 120 bottles of drinking water to be equally divided to each group of villagers. How many groups of villagers can be formed in this village?

• 3

• 8

• 11

• 24

Express 2058 in the form of prime factorisation.

The greatest length of a tape that can measure 15cm, 45cm, 2m 40cm and 1m 35cm is

• 5cm

• 10cm

• 15cm

• 30cm

Given 3, 5 and x are the prime factors of 165, find the value of x.

• 11

• 13

• 15

• 17