## What practical examples are there of uses of the real number line in everyday life?

Answer 1:

Mechanical devices for measuring.

Explanation:

Most mechanical devices for measuring contain part of the real number line.

Some examples:

- (Marked) ruler
- Protractor
- Kitchen/bathroom scales
- Micrometer (twice)
- Pressure gauge
- Barometer

Answer 2:

One you probably already use. The axis of a graph.

Answer 3:

The most obvious one we use daily is a thermometer – the temperature can increase from freezing point, but it is possible to have negative temperatures as well.

You can read your altitude on the screen of a GPS unit – it will tell you how high or even how far below sea level you are.