you do know that letters make math easier right?
for example you have a big number like: 12 trillion, it would show on a calculator as 1.2e+13.
this may seem confusing but it's pretty simple actually, "e" stand for the exponent (or power) of 10, there is always another number after this (the value of the exponent),.
so 1.2e+13 equals 12 trillion, and this is just one example.