[sonalkadam9]

Introduction: Squaring a number means you multiply the number by itself. It is easy to square small numbers. For example, 72 = 7(7) = 49. Other squares are harder to calculate in your head. Trying to solve 432 would be hard to do in your head. You can find the answer using a pencil and paper or it is easily found using a calculator. In this problem you will learn and use a "trick" to let you solve 432 and some other tough questions in your head.
Problem:

Before you learn the "trick", you must know how to and become quick at squaring the numbers between 1 and 9. Find a partner and take turns asking questions such as 52, 22, 92, 42, 12, 82, and so on. Try to give instant answers.
Now, here is a "trick" to square numbers between 41 and 59 in your head. In this "trick" 25 and 50 act like "magical" numbers. The two examples below show how the "trick" is used.

http://www.sasked.gov.sk.ca/docs/rub...s/mental01.gif

Now take turns with your partner posing and answering questions where you square numbers between 41 and 59 in your head. See how quickly you can answer the questions.