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First work out the lowest common multiple of 7, 8 and 9 and then any multiple of this is a common multiple of 7, 8 and 9.
The method I use is to list the numbers in their prime factorisation in power format; then the lcm is the product of each prime used to the highest power with which is appears in any of the factorisations. For 7, 8 and 9 this gives:
7 = 7
8 = 2^3
9 = 3^2
lcm = 2^3 x 3^2 x 7 = 504
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∙ 9y ago
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Who do you work out the common multiple of 7 8 and9?
Multiply them together.
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