9
1*9 = 9
8*9 = 72
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The Greatest Common Factor (GCF) is: 9
It is: 9
The HCF is 9
2 is a common factor of 24 and 72.
5/9+1/8=40/72+9/72 Common denominator is 72 since 8 and 9 can go into it evenly. 49/72 is simplest because 49 and 72 do not have a common factor other than 1.