Because exponential or scientific notation needs less digits for very large numbers and metric units are preferred because they are in multiples of 10 thus avoiding mistaken calculations.
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It is 6.78234*10^5.
Scientific notation is a way of writing numbers that are too big or too small to be conveniently written in decimal form. In normalized scientific notation all numbers are written in the form a x 10^b (a times ten raised to the power of b) where a is a nonzero single-digit integer and b is an integer.
Exponential notation is a useful way of writing big numbers. Exponential notation means "to the power of...". For example: 24 means 2x2x2x2 (2 times itself three times) 10^8 (another way of writing exponential notation) means 100000000 (1 with 8 zeros after it).
24 x 3 = 48
It is not always necessary. Scientific notation (also called standard form or exponential notation) is a way of writing numbers that accommodates values too large or small to be conveniently written in standard decimal notation.