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To get the Greates Common Factor (GCF) of 4050 and 100 we need to factor each value first and then we choose all the copies of factors and multiply them:
|4050: ||2|| ||3||3||3||3||5||5|
|100: ||2||2|| || || || ||5||5|
|GCF: ||2|| || || || || ||5||5|
The Greates Common Factor (GCF) is: 2 x 5 x 5 = 50