You need at least two numbers to find a GCF. If that's 4 and 5, the GCF of any two consecutive numbers is 1.
The hcf of 45 and 40 is 5.
The GCF is 45.
The HCF is 1.
The GCF is 1.
HCF(26, 45) = 1. The numbers are co-prime.
The GCF is 15.
The GCF is 5.
15 is the answer
To find the HCF of two numbers you first have to split them into their prime factors: 45 = 3x3x5 36 = 2x2x3x3 The next step is to identify any common prime factors. In this example, both numbers have two 3s as prime factors. Multiply these together and you get: 3x3 = 9 Thus the hcf of 45 and 36 is 9.
9
15
5