Answer:
45
Explanation:
270 = 1*225 + 45
225 = 5 * 45 + 0
HCF = 45
The above is Euclid's method for finding the HCF.
The other method is by finding the prime factors:
225 = 3 * 3 * 5 * 5
270 = 2 * 3 * 3 * 5
We pick out common factors:
So the HCF 3 * 3 * 5
= 45.