Anything in the 20 times table.
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Since 4 is a multiple of 2, all the multiples of 4 will be common.
Multiples of 4 include 4, 8 and 12. For them to be common, they need to be compared to another set of multiples.
The common multiples of 4 and 22 are 44, 88, 132 and so on.
lcm(4, 9) = 36 → the two least common multiples (ie the first two common multiples) of 4 and 9 are 36 and 72.
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.