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To get the Greates Common Factor (GCF) of 18928 and 1372 we need to factor each value first and then we choose all the copies of factors and multiply them:
|18928: ||2||2||2||2||7|| || ||13||13|
|1372: ||2||2|| || ||7||7||7|| || |
|GCF: ||2||2|| || ||7|| || || || |
The Greates Common Factor (GCF) is: 2 x 2 x 7 = 28