To figure this out you should first express the numbers as the product of their prime factors:
27 = 3x3x3
45 = 3x3x5
The next step is to identify any common prime factors. Both numbers have two 3s as prime factors. Multiply these together and you get:
3x3 = 9
Thus 9 is the HCF of 27 and 45.
LCM = product/HCF; the HCF of 27 and 45 is 9 so LCM is 27 x 45/9 ie 135.LCM is the smallest multiple of 2 numbers and can be found by factoring both numbers and multiplying the prime factors having the highest powers.Prime factors of 27 are 33Prime factors of 45 are 32 x 5LCM of 27 and 45 is 33x 5 = 135
The HCF is 1.
The GCF is 1.
HCF(26, 45) = 1. The numbers are co-prime.
The GCF is 15.
27
It is: 27
27
The GCF is 27.
The GCF is 5.
15
It is: 5