Square It - Mentally!

A quick trick of squaring

As you know, the square of a number is a number multiplied by itself. For example, the square of 7 is 7 x 7 = 49. Here you find a simple method that will enable you to easily calculate the square of any two-digit number, when the number ends in 5, so let’s do that trick now.

To square a two-digit number that ends in 5, you need to remember only two things.

1. The answer begins by multiplying the first digit by the next higher digit.

2. The answer ends in 25.

For example,

To square the number 35, we simply multiply the first digit (3) by the next higher digit (4), then attach 25.

Since 3 x 4 = 12, the answer is 1225. Therefore, 35 x 35 = 1225.

How about the square of 85?

Since 8 x 9 = 72, we immediately get 85 x 85 = 7225.

Here's a link for you to explore :- http://www.mathsisfun.com/square-root.html

Let me know whether you enjoyed using this mental trick or not.

Renu Ma'am