Just 1.
The factors of 64 are all 2s and the factors of 81 are all 3s. The greatest common factor is 1, since they have no factors in common. ■
1, 2, 4, 8, 16, 32, 64 1, 3, 9, 27, 81
The GCF of 64 and 81 is 1. 64:1,3,4,8,16,32,64 81:1,3,9,27,81
The factors of 64 are:1, 2, 4, 8, 16, 32, 64The factors of 81 are:1, 3, 9, 27, 81The Greatest Common Factor (GCF) is:1
Each one consists of one number repeated.
The LCM is 5184. The numbers 81 and 64 have no common factors. When you have two relatively prime numbers, you find their LCM by multiplying them. So 5184 is 81x64.
81 and 200 have no common prime factors.
The common factors of 15 and 81 are 1 and 3
The factors of 81 are 1, 3, 9, 27 and 81. For them to be common, they need to be compared to another set of factors.
The common factors of 72 and 81 are: 1, 3, and 9
34 and 81 share no common factors aside from 1.
The common factors of 36 and 81 are: 1, 3, and 9