SQUARES
1. Square of a number ending with 5
Let y5 be the number then
square is :- y*(y+1)25
Eg :-
35 * 35 = 1225
3*(3+1)25=1225
2. Square of a number near to a known square
This is real simple you just need to look around ,the formula is very familiar.
(n+1)^2 = n^2 +2*n +1
Eg:-
35^2 can be found easily,so 34^2 = 1225-2*34-1=1156
———————————————————————————–
To find the digit in the unit place of a number given in powers???
Have a look at the pattern below,here the case is with “powers of 2″
2^1 = 2
2^2 =4
2^3 …

Mathematics the base every engineering branch,is used not only by engineers,but by economists,historians,teachers…infact everyone need maths in there everyday life.And because of this importance of arithmetics almost every competitive exams test your maths skills.In most cases they test not only your skill but also your ability to use right thing at the right place.In  big exams like CAT,XAT, GMAT etc if we try answering the quatitative questions after the exam it will look easier to us.So the key in such exam is SWIFT thinking,and small tricks.Conventional maths is a bit …