Mental Maths Tricks for Everyone!

 let say you want to multiply 52*11.This can be calculated in less than 1 second but if you want to do it traditionally,it will take you around 5-6 seconds.Isn't it?

So let see how using a simple mental maths trick,this calculation can be done in a matter of seconds...

To multiply 52 and 11,imagine there is a space between 52

52*11= 5_2 (Put an imaginary space in between)

Now,what to do with that space?

Just add 5 and 2 and put the result in the imaginary space

So, 52 * 11 =572 (which is your answer)

Isn't it great?

niw moving on to some other tricks

(Q) Is 456138 divisible by 9?

Now, it only takes 2 seconds for you to determine the answer.But if you go by the traditional way then it will take you 10 seconds.So you can see the difference.Those 8 extra seconds you win,you can spend on other question.Isn't it?

No let see the solution

(Answer) To test whether a certain large number is divisible by 9 or not,'just add all the digits of the number and if the end result is divisible by 9,then you can say that the entire large number will be divisible by 9 too'.

4+5+6+1+3+8=27

Now since 27 is divisible by 9 so 456138 will be divisible by 9 too.

3rd trick is for multiplication

Multiply any large number by 12 mentally in seconds

To multiply any number by 12 just double last digit and thereafter double each digit and add it to its neighbour

For example  21314 * 12 =  255768

Lets break it into simple steps:

Step 1: 021314 * 12 =  _____8 (Double of Last Digit 4= 8 )

Step 2: 021314 * 12 =  ____68 (Now Double 1= 2, and add it to 4, 2+4=6)

Step 3: 021314 * 12=   ___768 (Now Double 3=6, and add it to 1, 6+1=7)

Step 4: 021314 * 12=   __5768 (Now Double 1=2, and add it to 3, 2+3=5)

Step 5: 021314 * 12=   _55768 (Now Double  2=4, and add it to 1, 4+1=5)

Step 6: 021314 * 12=   255768 (Now Double 0=0, and add it to 2, 0+2=2)

So your final answer of 21314 * 12 = 255768

Another example...

Calculating Square of numbers quickly...

Lets calculate the square of 54

  

So (54)^2 = 5^2 +4 -- 4^2 = 25 +4 ----16 =29-------16= 2916