What practical examples are there of uses of the real number line in everyday life?
3 Answers
Dec 22, 2016
Answer:
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
Dec 22, 2016
One you probably already use. The axis of a graph.
Dec 22, 2016
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.