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
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What are the first three common multiples of four and five
The first four multiples of five: 5, 10, 15, 20
For 3 its 3,6,9,12,15,18,21,24,27,30 For 5 its 5,10,15,20,25,30,35,40,45,50
To start with the 3 common multiples of 5 they are........10,15,and 25the 3 common multiples of 3 are.........15,30,and 45hope this helped=)
They are members of the set of numbers of the form 28*k where k = 1, 2, 3, 4 or 5.