Some tricks of mathematics

1.) Addition Of 9 to any positive number does not change the sum of the digits of the number. 9 is a single one digit number which does not change the sum of the digits of any number after additon of it to the number.

eg.: - (A) Take any number like 657852

Its sum of digits(6+5+7+8+5+2) is 33 which (3+3) is= 6.

Now add 9 to it. It now becomes 657852 + 9 = 657861.

Now sum the digits of this number it is (6+5+7+8+6+1) = 33 which turns to 6.

Means No change the sum of digits.

It can be checked on any number.



2.) The sum of any three numbers at the same interval is always divisible by 3.

eg:- Take any three numbers like 58, 65, 72 at same interval (here the interval is taken as 7, it may be any number)

Now sum the numbers (58 + 65 + 72) = 519 which is divisible by 3 with 173.

It can be checked on any three numbers at same interval.







Wait For Some times for more such tricks of mathematics



Comments are heartly invited.

If anyone gets any exceptions for the above 2 ones, then it should must be commented, such that further work could be processed on it.