It is using the scientific notation.
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scientific notation or standard form
The are used to represent numbers using powers of ten.
Roman numerals are very difficult to do mathematics with, and do not work at all in advanced mathematics as the roman numeral system has no concept of zero, negative numbers, fractions, powers, or decimals.
scientific :D
A negative exponent is put into fraction form because it is a way of writing powers of fractions or decimals.