HERE WE ARE NOT DOING MATH BUT MAKING SOME TRICKY TECHNIQUES THAT ARE VERY IMPORTANT WHEN WE HAVE TO DO A LOT OF MATHEMATICS WITHIN VERY CONSTRAIN TIME. SO TRY TO REMEMBER AND ENJOY THE TRICKS.......

# There are 25 prime numbers from 1-100. If you can remember the sequence like following technique then you can speedy calculate prime numbers from any range like 31-70, 36-83, etc.

1-10=4

11-20=4

21-30=2

31-40=2

41-50=3

51-60=2

61-70=2

71-80=3

81-90=2

91-100=1

Shortcut:

2- 322,

3- 321.

The factors of 6 is : 1,2,3 and 6.

The multiple of 6 is : 6,12,18,24.......

On the other hand according to Barron's GRE book,

The factors of 6 is : 1,2,3 and 6. Again,

-1,-2,-3,-6.

The multiple of 6 is : 6,12,18,24.......

Again,

-6,-12,-18,-24.....

# Always remember that 1 is not a prime number.

# Always remember that 0 is also a integer but it is neither positive nor negative.

# Want to remember the sequence of Roman numbers?

I =1

V =5

X =10

Everybody knows these three numbers. Now,

L
=50

C =100 (Century)

D = 500

M =1000
(Millennium)

The technique to remember the sequence is LCD Monitor. Ok.

# If you can remember the root over of 2= 1.41 and root over of 3= 1.73 then you can speedy calculate any math which have root over of 2 or root over of 3.

# If 4^{th} December of
2008 is Monday then 4^{th}
December of 2009 is what ?

- Technique: 365/7 = 52 weeks and 1 day so the answer is Tuesday.

In the case of leap year the answer will Wednesday. ( Leap year will calculate if the stipulated range of time contain Leap year February).