Different techniques/methods are used for fast calculation some of them are useful for objective-based competitive exams and many are useless (though you would find them fascinating and millions of views on such videos). In this section, we will cover relevant tricks only as learning thousands of tricks for calculation will only confuse you, we have divided the section into three parts:
a) Elimination Method: Used for eliminating wrong options from the question.
b) Speed Calculation: Used for speedy calculation and reaching the correct option.
As the name suggests this method does not give accurate answers to a question instead it can help to determine the correct option by eliminating incorrect options in objective-type questions. In this section we will discuss two methods:
1) Digit Sum Check
2) Last Digit Check
In this section, we will discuss all the important concepts of fast calculations that are relevant for objective-based competitive exams. Many books and coaching suggest 100s of useless concepts stating that the concepts will make you score well but in reality, they are useless and make quantittive aptitude complicated.
1) General Divisibility
2) Prime No. Divisibility