https://tcs.nju.edu.cn/wiki/api.php?action=feedcontributions&feedformat=atom&user=37.166.0.53 2026-05-04T20:28:03Z User contributions MediaWiki 1.45.3 https://tcs.nju.edu.cn/wiki/index.php?title=Mental_calculation&diff=7635 2016-10-30T09:34:48Z

<p>37.166.0.53: dead link</p> <hr /> <div>'''Mental calculation''' or '''mental maths''' is an old [[mathematics|mathematical]] tool. It is doing maths without using any objects or writing anything down. Mental calculation uses only the [[human]] brain. People who use mental maths use shortcuts to make the calculation easier. People who use mental calculation do not use a [[computer]] or a [[calculator]].<br /> <br /> == Calculation methods ==<br /> There are some [[methods]] to do mental maths. One way to do multiplications is the [[Russian peasant multiplication]]. An other way to do multiplications with two [[number]]s is to use [[Binomial theorem|binomial formulas]].<br /> <br /> &lt;math&gt; (x+y) \cdot (x-y)= x^2 - y^2 &lt;/math&gt;<br /> <br /> ==Other websites==<br /> <br /> [[Category:Mathematics]]<br /> <br /> <br /> {{math-stub}}</div>

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