Find the HCF and LCM of the following pairs using prime factorisation method:
(i) 140 and 154 (ii) 504 and 735

Explanation

To find the HCF (Highest Common Factor) and LCM (Lowest Common Multiple) of the given pairs of numbers using the prime factorization method, we will follow these steps:

### Part (i): Finding HCF and LCM of 140 and 154

**Step 1: Prime Factorization of 140**
- Start by dividing 140 by the smallest prime number, which is 2.
- \( 140 \div 2 = 70 \)
- Next, factor 70:
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