Factors and multiples
Let’s Practise
1 Find two numbers that both have 6 as a factor.
(a) Find the factors of 28 and 32. (b) Underline the numbers that are common factors of 28 and 32.
2
3 The numbers in the red circle are multiples of 25. The numbers in the blue circle are multiples of 10.
20
25
30 60 10 40
50
100
75
(a) Use the diagram to write down some common multiples of 10 and 25. (b) Leon says the number 120 should go in the overlapping section. Explain what mistake Leon has made.
Find the highest common factor of: (a) 21 and 35 (b) 56 and 77 Find the lowest common multiple of: (a) 8 and 10 (b) 7 and 12
4
(c) 121 and 144
5
(c) 15 and 9
25
SK_G5_SB_02_016-029.indd 25
01/12/2021 15:11
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