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To get the Greates Common Factor (GCF) of 1144 and 180 we need to factor each value first and then we choose all the copies of factors and multiply them:
|1144: ||2||2||2|| || || ||11||13|
|180: ||2||2|| ||3||3||5|| || |
|GCF: ||2||2|| || || || || || |
The Greates Common Factor (GCF) is: 2 x 2 = 4