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Sep 11
2008

### Math Square Numbers

Posted by: Bruce

Tagged in: Tutorial , Math Magic

Have you seen those square Easter eggs I got one and it was delicious!

This magical maths trick involves square numbers. Remember, you get a square number by multiplying a number by itself. For example 6 x 6 = 36. 36 is a square number.

There is an amazingly quick way of squaring a two digit number which ends in 5. All you have to do is multiply the first digit by the number one more than it, and then put a 25 on the end of your answer.

Eg: 35 squared
3 x 4 = 12
put 25 on the end makes 1225

Note: this only works for two digit numbers that end in 5.

##### ...
It's very easy:

eg:
35^2 = 3*(3+1) and add 25 on the end of the answer (1225)
75^2 = 7*(7+1) and add 25 on the end of the answer (5625)
and so on...
Bruce , December 06, 2008
##### I don't get it
I don't get
sophia , December 04, 2008

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