Fractions of 1 to 30

Time is golden. So, Im going to give you the tips to save time during calculations in data interpretation and quantitative analysis.

Beginning with fractions from 1/1 to 1/30 :

Till 1/1 to 1/5, its easy. You probably have these on your tips already.
For convenience purposes, ill deal the fractions as percentages. [ The actual fraction is the answer divided by 100]

1/1 : 100
1/2 : 50
1/3 : 33.33
1/4 : 25
1/5 : 20

Now let's begin the tough ones. Ill try to make you understand the patterns here :

1/6 : 16.67 and 1/15 : 6.67 [ Got it? ]
1/7 : 14.2856 [ 7x2=14 ; 7x4=28 ; 7x8=56 ]

TIP : The fractions of the multiples of a number can be calculated by just dividing the source fraction by the multiplication factor .
Eg. : 1/2 : 50 ; 1/4 : 25 ; 1/8 : 12.5 ;

So, by this way, we get the following fractions :
1/8 : 12.5
1/10 : 10
1/12 : 8.33 [ 1/6 =16.67 remember??]
1/14 : 7.14
1/16 : 6.25
1/20 : 5
1/24 : 4.16
1/25 : 4
1/30 : 3.33

Now, something goes in pairs :
1/9 : 11.11
AND
1/11 : 9.09

So, once you get 1/9 and 1/11 . Therefore you get
1/22 : 4.545 [ forty five forty five]
1/18 : 5.56

Now, some weird, but easy to learn patterns :
1/13 : 7.69 [ 13 square =169 ; just replace the one by seven ]
Hence ; 1/26 : 3.84

1/28 : 3.56 [ 28x2=56 ]
1/27 : 3.7 [ twenty seven is thirty seven ]

The last few :
1/17 : 5.88
1/19 : 5.26
1/21 : 4.76
1/23 : 4.34
1/29 : 3.44

You can make your combinations too. Post a comment here, if you come up with something.
Just have a look at these fractions for 2 or 3 times a day, and in a week, you'll remember them all. This surely will save you lot of time in the CAT .