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....