Multiples of 10.
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The prime factors of 200 are 2 and 5 or as a product of its prime factors 2*2*2*5*5 = 200
30 and all multiples of 30 have factors including 2, 3, and 5.
2, 3, and 5 are factors of 30 and all multiples of 30.
The prime factors of 144 are 2, 2, 2, 2, 3 and 3 The prime factors of 300 are 2, 2, 3, 5 and 5 So the only prime numbers which are common to both numbers are 2, 2 and 3 = 12
30 and 60 have 2, 3, and 5 as factors, as do all other multiples of 30.