Round off the following numbers upto three significant figures.
(i)2.520 , (ii)4.645 , (iii)22.78 , (iv)36.25

Explanation

To round off the given numbers to three significant figures, we follow a systematic approach. Here are the steps for each number:

### Step-by-Step Solution:

1. **Rounding 2.520 to three significant figures:**
- Identify the first three significant figures: 2, 5, and 2.
- Look at the fourth digit (0). Since 0 is less than 5, we do not change the last significant figure.
- Therefore, the rounded number is **2.52**.
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