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Scientific Notation and Decimals
Scientific notation is a representation where decimals are expressed as the product of a number with just one digit to the left of the decimal point and a power of 10.
For example in scientific notation, 823 = 8.23 × 102, 82.3 = 8.23 × 101, 0.823 = 8.23 × 10−1, and 0.0823 = 8.23 × 10−2.
The exponent of 10 gives the number of places the decimal point is to be moved to obtain the product.
A positive exponent moves the decimal point to the right and a negative exponent moves the decimal point to the left.
For example, 3.194 × 104 = 31940 and 3.194 × 10−4 = 0.0003194
Click here for more about exponents
GMAT Math Review - Arithmetic : Index for Decimals
GMAT Math Review - Arithmetic : Practice Exercise for Decimals
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