## Overview

Audio for slide 1 (mp3 |6|KB)

There are some calculations you can do in your head.

Counting items and working out simple quantities are calculations that people do all the time, almost without thinking about it.

But as the numbers get bigger or more complex, most people need to use a calculator to be sure that they've got the right result.

Counting items and working out simple quantities are calculations that people do all the time, almost without thinking about it.

But as the numbers get bigger or more complex, most people need to use a calculator to be sure that they've got the right result.

Audio for slide 2 (mp3 |6|KB)

Fortunately, calculators are everywhere these days.

You'll find them in mobile phones, on rulers, in large diaries, and of course as self-contained pocket-sized devices.

If you need to do specialised calculations as part of your work, it's easy to carry a scientific calculator, laptop computer or tablet with you so that it's on hand when required.

You'll find them in mobile phones, on rulers, in large diaries, and of course as self-contained pocket-sized devices.

If you need to do specialised calculations as part of your work, it's easy to carry a scientific calculator, laptop computer or tablet with you so that it's on hand when required.

### Completing this section

Audio 4 (mp3 |6|KB)The material covered in this section will help you to complete the assignment set for this unit. You find details of the assignment at the end of Section 2. Have a look at it now to see what you'll need to do to complete it.

Also in the menu bar are links to the lessons for this section:

*Using a calculator**Working with fractions**Decimals and percentages**The metric system**Using tallies.*

These lessons will provide you with background information that relates to the assignment.

Go to Using a calculator