Question

Find the HCF and LCM of 36 and 84.

Solution

1. 36 = 2^2 x 3^2 and 84 = 2^2 x 3 x 7.
2. HCF uses the lowest powers: 2^2 x 3 = 12.
3. LCM uses the highest powers: 2^2 x 3^2 x 7 = 252.