Question

Find the HCF of the number of the following using the prime factor method

Answer 1

for example 9;27

9 = 1 × 3 × 3. 

27 = 1 × 3 × 3 × 3. 

Common factor of 9 and 27 = 1, 3 and 3. 

Highest common factor of 9 and 27 = 3 × 3 = 9.