The number is 1.
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The numbers 1, 3 and 9 all go into both 72 and 171.
It is: 1
The smallest number that is a multiple of both 72 and 117 is 936.
If you mean the HCF (highest common factor) it is the highest number which goes into both numbers. In this case it would be 9, as 9x3=27 and 9x8=72.The GCF is: 9
1 and 3.