Because sometimes numbers get very big or very small.
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Scientific notation is used because it makes the numbers much easier
to write, remember, report to others, and do arithmetic with.
There is no true opposite of scientific notation, but the closest answer is Standard Notation.
You do not simply calculate scientific notation for nothing. You need a number for which you calculate the scientific notation.
It is simply 1.72*10^2 in scientific notation
It is: -5.034*10^2 in scientific notation
It is: 1.234*10^3 in scientific notation