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To get the Greates Common Factor (GCF) of 756 and 414 we need to factor each value first and then we choose all the copies of factors and multiply them:
|756: ||2||2||3||3||3||7|| |
|414: ||2|| ||3||3|| || ||23|
|GCF: ||2|| ||3||3|| || || |
The Greates Common Factor (GCF) is: 2 x 3 x 3 = 18