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To get the Greates Common Factor (GCF) of 163350 and 18 we need to factor each value first and then we choose all the copies of factors and multiply them:
|18: ||2||3||3|| || || || || |
|GCF: ||2||3||3|| || || || || |
The Greates Common Factor (GCF) is: 2 x 3 x 3 = 18