Common factors Let’s Learn Together
1 The factor diagram shows the factors of 45 and 54.
54 18 27 9
1
45
1 3 2 6
45
54
3
15
5
9
There are some factors that are common to both number. The numbers 3 and 9 are common factors of 45 and 54. The highest common factor is 9.
2 Look at the first 9 multiples of the numbers 2 and 3.
2: 2, 4, 6, 8, 10, 12, 14, 16, 18 3: 3, 6, 9, 12, 15, 18, 21, 24, 27 There are some multiples that are common to both numbers. The numbers 6 and 18 are common multiples of 2 and 3. The lowest common multiple is 6.
I predict that the next common multiple is 24.
24
SK_G5_SB_02_016-029.indd 24
01/12/2021 15:11
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