User:Prabhasclass8/sandbox

Following are some useful math tricks:

 * To square a number ending with 5
 * Let's take 85.Take the digit of the tens place ,i.e, 8 and multiply with its successor,i.e, 9.Result is 72.Place 25 at the end of the result.Now, the answer is 7225.
 * To find the average of the numbers from 1 to 'n'
 * For example, we have to find the average of numbers from 1 to 19.Firstly, Add 1 and 19.The result is 20.Now divide the result by 2.Your answer is 10.

Following are some useful math tricks:

 * To square a number ending with 5
 * Let's take 85.Take the digit of the tens place ,i.e, 8 and multiply with its successor,i.e, 9.Result is 72.Place 25 at the end of the result.Now, the answer is 7225.
 * To find the average of the numbers from 1 to 'n'
 * For example, we have to find the average of numbers from 1 to 19.Firstly, Add 1 and 19.The result is 20.Now divide the result by 2.Your answer is 10.