Mental Maths For Competitive Exams


One of the keys to succeeding in competitive examinations just like the JEE Mains or Advanced is effective time management. Years of diligence and knowledge are rendered futile if you’re unable to use them within the allotted 180 minutes.

As per feedback from JEE aspirants who have appeared for the exams within the past, there’s a consensus that the largest chunk of your time during the exam is spent completing math calculations. Furthermore, no calculators or electronic devices are allowed during the exam, which makes it even more important for JEE aspirants to employ mental math tricks – it helps them calculate much faster.

Mental Math is magical

Learning mental math calculation is crucial to performing well in competitive exams – numbers will not scare you and even the most difficult exam problems will appear to be child’s play.

Imagine if you’re required to calculate 3845 x 2500 during the JEE exam! What is going to you do? Sit down with a pen and paper to hold out long multiplication? Or, apply your newly acquired math calculation skills to reach the solution 96,12,500 in just 2 minutes? Most JEE aspirants would want to require the second route and now you’ll, too!

Left is that the New Right

Remember how, in class, we were taught to feature and subtract ranging from the rightmost digit to the left? Well, things have changed now. for straightforward and fast mental math

calculations, you ought to add or subtract from the left to the right. For instance, adding 340 + 215 will quickly give you the answer: 555.

Remember Your Tables

It is essential that you simply remember your basic tables of 12, 13, 14, 15, and more – it’ll offer you another edge to calculate big numbers faster, thus saving on calculation time. Alongside tables, it’s also recommended that you simply practice remembering fractions and percentage values, too. Example: 3/4th also can be considered 75%.

Round It Up

Another great point to remember while attempting the JEE exam or any other competitive exam is to keep a cool head, which will help you recall and apply these math tricks. Rounding off

numbers while carrying out calculations may be a great trick and may be useful while solving the doorway test paper. Imagine you’ve got to calculate 689 + 350. Now, with the rounding-off method, we simply round up 689 to 700 and add 700 + 350 which is equal to 1050. Now, as 700 – 689 is 11, we simply subtract 11 from the result and reach the answer of 1039. Child’s play, isn’t it?

Learning Your Squares

The square of 4 is 16, the square of seven is 49 while the square of 14 is 196. It’s advised that each JEE aspirant learn these square tables till 20 – it’ll offer you a quick alternative to mentally calculating numbers.

Breaking Down Problems

A few questions in the exam might feel difficult or confusing – the simplest way to tackle them is by breaking down the problems into a few ‘easy to calculate’ steps.

This strategy will certainly assist you in making faster and more accurate calculations. For instance, if you would like to multiply 6 x (85 + 30), what would you do? As per the rules of BODMAS, we will solve this problem as: (6 X 80) + (6 x 5) + (6 x 30) = 690.

Hone your mental calculation abilities by practicing consistently and following these five tips – and soon enough you’ll ace the JEE and all other competitive exams with enough time to spare!

Also published on Medium.

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