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To get the Greates Common Factor (GCF) of 243 and 1125 we need to factor each value first and then we choose all the copies of factors and multiply them:
|243: ||3||3||3||3||3|| || || |
|1125: ||3||3|| || || ||5||5||5|
|GCF: ||3||3|| || || || || || |
The Greates Common Factor (GCF) is: 3 x 3 = 9