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ssahnaz

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Karma
6
Created
February 20, 2012 (14y ago)
Submissions
0
  1. How to extract cube roots mentally in less than 5 seconds (mathema-tricks.blogspot.com)
    2 points 0
  2. How to multiply two 3-digit numbers between 100 and 109 easily and quickly (mathema-tricks.blogspot.com)
    1 points 0
  3. How to Square a 2-digit number beginning with 5 in the blink of eyes (mathema-tricks.blogspot.com)
    1 points 2
  4. How to do arithmetical calculations using only the human brain (mathema-tricks.blogspot.com)
    2 points 1
  5. How to prove 0.999… = 1.

    The meaning of 0.999… is a tricky concept, and depends on what we allow a number to be. For non-math persons, you will probably disagree with the equality, but there are many elementary proofs that could show it.…

    4 points 3
  6. How to Square numbers made up of 1

    Here is a cool trick to square numbers made up of repeating 1 (one). Count the number of repeating 1 in the number to be squared and put the digits ascending from 1 up to that number. That is, if there are four 1's in…

    1 points 1