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To get the Greates Common Factor (GCF) of 4320 and 100 we need to factor each value first and then we choose all the copies of factors and multiply them:
|4320: ||2||2||2||2||2||3||3||3||5|| |
|100: ||2||2|| || || || || || ||5||5|
|GCF: ||2||2|| || || || || || ||5|| |
The Greates Common Factor (GCF) is: 2 x 2 x 5 = 20