#### Topic Content:

- Approximation Involving the Four Basic Operations

### Addition:

### Worked Example 12.6.1:

What is the approximated answer to each of the following addition problems? **i.** 708 + 194**ii.** 57.6 + 83.9

**Solution**

Round each number to 1 s.f or to the nearest 100. We have

**i.** 708 + 194 ≈ 700 + 200 = 900

**ii.** 57.6 + 83.9 ≈ 60 + 80 = 140

### Subtraction:

### Worked Example 12.6.2:

Round off each number to 1 s.f.**i.** 3072 – 1365**ii.** 595.845 – 96.869

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