Real Numbers (NCERT Exercise 1.2) Q1: Express each number as product of its prime factors: (ⅰ) 140 (ⅱ) 156 (ⅲ) 3825 (ⅳ) 5005 (ⅴ) 7429 Answer: (ⅰ)  140 = 2 × 2 × 5 × 7 = 2 2 × 5 × 7 (ⅱ)  156 = 2 × 2 × 3 × 13 = 2 2 × 3 × 13 (ⅲ)  3825 = 3 × 3 × 5 × 5 × 17 = 3 2 × 5 2 × 17 (ⅳ)  5005 = 5 × 7 × 11 × 13 (ⅴ)  7429 = 17 × 19 × 23 Q2: Find the LCM and HCF of the following pairs of integers