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How to square two digit number starting from 5

Sqaure Numbers easily

You can easily do the square of two digit number starting with 5 using this rule.

Suppose you have a number of the format 5x to be square for example say 54. Then it can be formed mentally using as follows:

  1. First do X + 25  Рthen in our example it will be 4 + 25 = 29
  2. The do the X2 – In our example it will 42 = 16
  3. Assemble the two results as follows Р2916

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