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step 1: list all of the prime numbers that go into 30 and 24.

2*3*5 =30

2*2*2*3=24

step 2: find all the common prime numbers between both sets.

2*3*5 =30

2*2*2*3=24

2*3

step 3: multiply your answer.

2*3=6

6 is the greatest common factor

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13y ago

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