For computations and Measurement ;))
everywhere
How do we use the number 80 in are daily life?
use in counting
if i want something new
well you use them for math
You will use the numbers pi and e (or applications which use them).
In most of the world, these are the numbers which you would use in daily life.
In real life one can do very well with nothing but rational numbers. Real numbers that are not rational can be approximated with whatever degree of accuracy is needed, which is exactly what computers and calculators do . Real numbers are essential to mathematical theory but unless you are a mathematician or need to understand higher mathematics in a rigorous way, you can do very well with only a vague , intuitive understanding of real numbers. In fact, it was not until 1870 ,or so, that mathematicians devised a satisfactory definition of real numbers.
usage of herons formula in real life
If we think about our daily lives and how numbers affect it. For example Money!! If we didn't have numbers there would be no real way to determine the amount of money we have/earn. So just figure out where you use numbers in you daily live and what would happen if it all changed. That's what would happen if there were no numbers in the world:)
Composite numbers can be used by businessmen, shopkeepers etc. These people use calculations a lot in their daily life.
your weight