The only common factor is 1.
1 is the only common factor of 18 and 61.
The GCF is 1.
The first common multiple (but not the lowest) of 6, 9 and 18 - that falls between 61 & 107 is... 72
3.3889
61
The factors of 61 are 1 and 61. For them to be common, they need to be compared to another set of factors.
3 with remainder 7.
79-18 = 61
34 + 61 - 64 + 18 = 13
The greatest common factor of 61 and 46 is 1.
The greatest common factor of 54 , 61 = 1
The greatest common factor of 61 , 37 = 1