When you count anything, such as electrons in an atom, atoms in molecules, quantum numbers, ..... mechanical advantages of rope and pulley systems, how many halves in a whole, ...how many teeth you have, how many hearts you have, how many fingers you have, how many hundredths are in 1.56, how many degrees in a complete circle, how many planets do humans live on
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Every aspect of mathematics depends upon integers, and even if you don't do any mathematics, you count things with integers. If you even want to know how many guests you are having for dinner, you need to use integers.
You can sometime use integers but often speed or velocity can also be irrational.
Yep.
Yes.
we see it on the weather network and we use it to measure stuff in baking and um science and um auto mechanic shop (i totaly recommend T.R.S Auto or J.S Auto just saying.)