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To get the Greates Common Factor (GCF) of 245 and 510 we need to factor each value first and then we choose all the copies of factors and multiply them:
|245: || || ||5||7||7|| |
|510: ||2||3||5|| || ||17|
|GCF: || || ||5|| || || |
The Greates Common Factor (GCF) is: 5