Question

3. The number 792 and 990, written as the products of their prime factors, are 792 = 23 x 32 x 11 and 990 = 2 x 32 x 5 x 11. Hence find the greatest whole number that will divide both 792 and 990 exactly.

Answer 1

792 = 2×2×2×3×3×11

990 = 2×3×3×5×11

Common Factors =2×3×3×11

HCF = 6×33

HCF = 198