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 will follow the rules of rounding based on the value of the digit immediately following the third significant figure. Here’s a step-by-step solution for each number:

### (i) 2.520
1. Identify the first three significant figures: **2.52**0.
2. The fourth significant figure is **0** (which is less than 5).
3. Since the fourth digit is less than 5, we keep the third significant figure unchanged.
4. Therefore, the rounded number is **2.52**.

...