• Just remember for negative powers of 10:
  • based on powers of 10 are also used to describe small or large quantities. For example, the prefix  means , so a kilometre is .
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The Power of One: A Novel


The term was used by the mathematician for the square of a line. discovered and proved the law of exponents, 10 10 = 10+, necessary to manipulate powers of 10. In the 9th century, the Persian mathematician used the terms for a and for a , which later mathematicians represented in as and , respectively, by the 15th century, as seen in the work of .

In the base ten () number system, integer powers of 10 are written as the digit 1 followed or preceded by a number of zeroes determined by the sign and magnitude of the exponent. For example, and .


A lot of reporting is often about counting