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Numerical Methods at work

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Permission to use, copy, and distribute this software and It’s documentation for any non commercial purpose is hereby granted without fee, provided: THE SOFTWARE IS PROVIDED "AS-IS" AND WITHOUT WARRANTY OF ANY KIND, EXPRESS, IMPLIED OR OTHERWISE, INCLUDING WITHOUT LIMITATION, ANY WARRANTY OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE. IN NO EVENT SHALL Henrik Vestermark, BE LIABLE FOR ANY SPECIAL, INCIDENTAL, INDIRECT OR CONSEQUENTIAL DAMAGES OF ANY KIND, OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER OR NOT ADVISED OF THE POSSIBILITY OF DAMAGE, AND ON ANY THEORY OF LIABILITY, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.

Practicing Metal Math


Regardless of using mental math trick as a party thing or trying to keep you brain sharp and healthy it has always bother me that there was a lack of web site dedicated to practise mental math trick. On this page I present to small webapplications to help you practice these mental tricks.


Calculating the Weekday on any date

First application is for practising week of the day for any date in any centuries. e.g. what is the weekday of Sep 4, 1957?. This application generate some random days based on one or more centuries selected and you can check you answer and keep track on your score.
Day of Week practice


Calculating Cubic root in your head

The second application help you practise mental cube root of a random generated cubic square of a integere number. You can choose between cubic root of 1, 2 or 3 digit numbers.
Nrooth Practice


Practicing Modulo Calculation

The third applicatiion is for practicing mental modulo calculation which is useful for checkking the validity of addition or multiplication of several numbers plus the Casting out 9 math trick.
Casting out 9