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highwireact

15. Why? Because 30 = 15 x 2 and 75 = 15 x 5; 2 and 5 have no common factors, which means that 15 is the largest number which goes evenly into both numbers - we can't "pull" any more common factors out from 2 and 5.

brianawebb1028
The Greatest Common Factor of 30 & 75 would be 15.

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