40, 80, 120 +40 . . .
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The multiples of 4 up to 30 are: 4, 8, 12, 16, 20, 24, 28.
Multiples of 4 include 4, 8 and 12. For them to be common, they need to be compared to another set of multiples.
Multiples of 8 are 8, 16, 24, 32, 40, 48... Multiples of 6 are 6, 12, 18, 24, 30, 36, 42, 48... Multiples of 4 are 4, 8, 12, 16, 20, 24, 28, 32, 36, 40... Multiples that 8, 6, and 4 have in common are 24, 48, 72...
The common multiples of 3, 4, and 8 are numbers that are divisible by all three of these numbers. To find the common multiples, we first list the multiples of each number: Multiples of 3: 3, 6, 9, 12, 15, 18, 21, 24, ... Multiples of 4: 4, 8, 12, 16, 20, 24, ... Multiples of 8: 8, 16, 24, 32, ... The common multiples of 3, 4, and 8 are 24, 48, and so on, as they are the numbers that appear in the lists of multiples of all three numbers.
The first five multiples of 4 are 4, 8, 12, 16 and 20. For them to be common, they need to be compared to another set of multiples.