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Become A Human Calculator, Solve Calculations Without Calculators
Learn how to solve calculations without the use of your calculator.
It is no longer a news that the trends of exams are changing, the use of calculators has been scrambled from many examination platform both at secondary and tertiary levels and so it is expedient to know how to solve very fast without the use of a calculator.
Below are some few examples of what the main package contains:

 Multiplication by 11

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


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

Now, lets fill the 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?

Let’s try some more examples:


1) 35 * 11 = 3 (3+5) 5 = 385

2) 81 * 11 = 8 (8+1) 1 = 891

3) 72 * 11 = 7 (7+2) 2 = 792 etc..
With just a little bit of practice you can easily perform these simple mental maths tricks in the blink of an eye.


 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 the next and right each result:
I know it sounds boring and senseless, just check the examples below to get it clearly;

For example 21314 * 12 = 255768

Let’s 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


 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.

 Calculating Square of numbers quickly...
Squaring numbers is quit easy check the examples below:
Lets calculate the square of 54

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

Similarly (55)^2 = 5^2 +5 --5^2=25+5------25=30---------25= 3025

Similarly (56)^2 = 5^2 + 6--6^2=25+6------36= 31--------36= 3136 etc..

Similarly try out squares of 57, 58 etc..

Some of this might not make full sense to you for now, but I can assure that with the full Amazing mathematics Tricks E-book would give you all the explanations you need in a simple and clear way, try it out following the link below to get on Okada online book store:

Get the complete PDF for just #300 at http://okadabooks.com/book/about/amazing_mathematics_tricks/12739

You stand the chance to learn how to solve the following without the use of calculators:

> Addition Tricks
> Subtraction Tricks
> Multiplication Tricks
> Squaring of Numbers
> Square roots of Numbers, as well as
> cube roots of numbers and lot more.

http://okadabooks.com/book/about/amazing_mathematics_tricks/12739