These quant shortcut tips and tricks for CAT will help you answer your questions in 10-15 seconds. We have tried to cover all the important topics of quant. So, do make your own notes.
Table of Contents
We will cover the following quant shortcut tips and tricks for CAT:
This trick is also called Triangle Trick. This trick is so simple that you can answer by simply looking at the question.
If you throw a dice twice, the total number of possible outcomes are 6 x 6 = 36. Similarly, if you throw two dice once, then again total number of possible outcomes are 6 x 6 = 36. So, throwing a dice twice or throwing two dice once is one and same thing. The number of cases are exactly same in both the cases.
The conventional method of answering the questions were to count all the possible outcome like (1,1), (1,2) and soon. But in this trick, you make a triangle like show below
The base of triangle is the minimum sum of outcomes of two dices i.e 2 and 12. The number on inner side of triangle represents the maximum number of cases of sum of outcomes of two dices.
Lets’ take an example, if you throw two dices, what is the probability that sum of outcomes of two dices is 5. It is clear from above triangle that there are 4 cases for sum as 5. Therefore, probability comes out to be 4/36 i.e. 1/9.
Similarly, you can answer any question related to dice.
The prime number is that number which has only two factors i.e. one factors is number 1 and other factor is the number itself. Also remember the lowest prime number is 2. The number one (1) is neither a prime number nor a composite number.
In exam, you will be asked following types of questions:
You can easily remember each prime number upto 20 or 30, but after that it is very difficult to remember which number is prime number.
The trick is to remember the code: D D B B C B B C B A and write it as per table shown below:
As per table above, there are:
So, there are 25 prime numbers between 0-100.
Sample Question: How many prime numbers are there between 0 and 50?
Answer: Look at the table above and sum up the number upto 50. i.e. 4+4+2+2+3 = 15
Similarly, you can answer any questions related to number of prime number between 0 to 100.
This trick will help you solve any questions of simple interest and compound interest without using any formula.
In simple words, compound interest means interest on interest. Lets’ illustrate it with the help of an example. Assume you have Rs 1000 to invest for 3 years at rate of interest of 10%. Lets’ see the difference between simple interest and compound interest as shown below:
In these type of questions, you just need to calculate the net interest rate.
Trick to calculate simple interest
From above table we can conclude that at simple interest:
We can easily identify that each year 10% interest is getting added. So, you just need to multiple rate of interest with number of years to get the total interest rate.
Sample Question: What is interest earned on sum of Rs 5000 lent at simple interest of 12% for 5 years?
Answer: In 5 years, total interest rate will become 12% x 5 = 60%, so our answer will be 60% of Rs 5000; which comes out to be Rs 3000.
Trick to calculate compound interest
In compound interest question also, the shortcut is to calculate the net interest rate. For example, to calculate compound interest on sum of Rs 1000 at simple interest of 10% per annum for 2 years, the trick to calculate compound interest is 10 + 10 + (10 x 10)/100 = 21. So your net interest rate comes out to be 21%. 21% of Rs 1000 is Rs 210. So, your answer is Rs 210.
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