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To get the Greates Common Factor (GCF) of 1680 and 212520 we need to factor each value first and then we choose all the copies of factors and multiply them:
|1680: ||2||2||2||2||3||5||7|| || |
|212520: ||2||2||2|| ||3||5||7||11||23|
|GCF: ||2||2||2|| ||3||5||7|| || |
The Greates Common Factor (GCF) is: 2 x 2 x 2 x 3 x 5 x 7 = 840