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To get the Greates Common Factor (GCF) of 1800 and 5625 we need to factor each value first and then we choose all the copies of factors and multiply them:
|1800: ||2||2||2||3||3||5||5|| || |
|5625: || || || ||3||3||5||5||5||5|
|GCF: || || || ||3||3||5||5|| || |
The Greates Common Factor (GCF) is: 3 x 3 x 5 x 5 = 225