They are members of the set of numbers of the form 28*k where k = 1, 2, 3, 4 or 5.
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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.
90, 180, 270, 360, 450 28, 56, 84, 112, 140
What are the first three common multiples of four and five
The first four multiples of five: 5, 10, 15, 20
for three 3 6 9 12 for five 5 10 15 20 these both numbers dont share a common denominator in the first 4 multiples