Greatest Common Factor (GCF) of 450 and 420

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To get the Greates Common Factor (GCF) of 450 and 420 we need to factor each value first and then we choose all the copies of factors and multiply them:

450:   2 3355 
420:   223 5 7
GCF:   2 3 5  

The Greates Common Factor (GCF) is:   2 x 3 x 5 = 30

 

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