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# Arithmetic : Decimals

 Preparation Just what you need to know !

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

10 more pages in GMAT Math Review

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