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<p>writing numbers of very large and very small sizes compactly.</p>

<p>A number written in scientific notation has a <a href="page.php?w=significand">significand</a> (sometime called a mantissa) multiplied by a power of ten.</p>

<p>Sometimes written in the form:</p>

<p>
: m&nbsp;×&nbsp;10<sup>n</sup></p>

<p>Or more compactly as:</p>

<p>
: 10<sup>n</sup></p>

<p>This is generally used to denote powers of 10.  Where n is positive, this indicates the number of zeros after the number, and where the n is negative, this indicates the number of</p><p>
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