SQUARE of any number ending with 5

There is an easy way to find the square of a number which ends with 5.

The method is so easy and so fast, that next time when you need to find the square of a number ending with 5, you will probably use it instead of a calculator.

Here below is the procedure in 2 steps. It is later illustrated with an example.

• Step a: Take the number(s) that precede(s) the 5, and multiply it by one number higher.
• Step b: Then concatenate the number 25 to the right of this product.

That will be the final result.

See Examples below:

Square of number 85:
Step a: 8 x 9 = 72
Step b: Concatenate number 25 to the right of 72.

Result is then: 7225

Square of number 105:
Step a: 10 x 11 = 110
Step b: Concatenate number 25 to the right of 110.

Result is then: 11025

Here below find some other Math Sections from which you can choose:

If you have any suggestions, comments, please e-mail me at caesar@ProfessorV.com Otherwise, come back soon.