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To get the Greates Common Factor (GCF) of 210 and 2470 we need to factor each value first and then we choose all the copies of factors and multiply them:
|210: ||2||3||5||7|| || |
|2470: ||2|| ||5|| ||13||19|
|GCF: ||2|| ||5|| || || |
The Greates Common Factor (GCF) is: 2 x 5 = 10