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To get the Greates Common Factor (GCF) of 1078 and 100 we need to factor each value first and then we choose all the copies of factors and multiply them:
|1078: ||2|| || || ||7||7||11|
|100: ||2||2||5||5|| || || |
|GCF: ||2|| || || || || || |
The Greates Common Factor (GCF) is: 2