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To get the Greates Common Factor (GCF) of 30 and 2040 we need to factor each value first and then we choose all the copies of factors and multiply them:
|30: ||2|| || ||3||5|| |
|GCF: ||2|| || ||3||5|| |
The Greates Common Factor (GCF) is: 2 x 3 x 5 = 30