Easy to Multpliy or divide

It is very easy to multiply by 10 or multiples of 10 i.e. 100,1000,10000 etc.

Just transfer the  0 to that number.

Ex.

a. 2*10= 20.
b. 21*100=2100
c. 2345*1000=2345000.

Now let us suppose that we want to multiply a digit number , THEN MOVE THE DECIMAL TO THE PLACES RIGHT THE NUMBER OF ZEROS.

Ex.

a. 1.2 * 10= 12                  (1 place right )
b. 1.2345 * 100 = 123.45  (2 places right )
c. 2.5478 * 1000= 2547.8 (3 places right )

Same is with division . In place of RIGHT MOVE LEFT.

a. 1234.5 / 10 = 123.45   (1 place left)
b. 1234.5 / 100 = 12.345 (2 place left)
c. 1234.5 / 10000 = 0.12345 (4 place left)
d. 1.2 / 1000 =  0.0012 (3 place left )

More to come....

Fastest Way to multiply - Second step.

Let us suppose we want to multiply .

24
24
=====
We write it as .
 Multiply first 4*4 =16
                     2*4*2=16+1=17
                     2*2=4+1=5
24
24
======
 2*2+1    2*4*2+1   4*4
       5             17             16
       5               7                6
   576


See another example.

94
94
-----
     9*9+7       2*9*4+1    4*4
       88            73                16
       88              3                  6
       8836

I think that you have understood the trick . If not please comment on it.
More tricks coming soon..................

Fastest Way to multiply

If you wan to multiply two digit number ending in 5 then follow this example.

Let us say we want to multiply 
25 * 25

Here we are at first multiply 5*5=25
Then multiply  2*3 (unit digit with one predecessor)=6
Therefore answer is
      25
  X 25
--------------
     625
--------------
You can try it for others also

Another example is :

95
95
-----
9025
-----

Keep watching ............