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Exponents are negative numbers. This is used in math a lot.
Multiplying numbers in scientific notation is easier when the numbers are very, very large or very, very small. Multiplying 0.000000000385 x 0.0000000474 is a pain. Multiplying 3.85 x 10-10 x 4.74 x 10-8 is not.
Scientific notation is a way to express very large or very small numbers. For very large exponent is positive; for very small exponent is negative. For example, 1,000,000 is 1 x 10 to the plus 6 exponent; 0.000001 is 1 x 10 to the negative 6 exponent
In scientific notation, distance is calculated by multiplying a number between 1 and 10 (known as the coefficient) by a power of 10 (known as the exponent). The exponent represents the number of places the decimal point is moved to the right (positive exponent) or to the left (negative exponent). This notation is commonly used to represent large or small distances, such as in astronomy or nanotechnology, where writing out the entire number would be cumbersome.
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.