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To get the Greates Common Factor (GCF) of 39375 and 77625 we need to factor each value first and then we choose all the copies of factors and multiply them:
|39375: ||3||3|| ||5||5||5||5||7|| |
|77625: ||3||3||3||5||5||5|| || ||23|
|GCF: ||3||3|| ||5||5||5|| || || |
The Greates Common Factor (GCF) is: 3 x 3 x 5 x 5 x 5 = 1125