Rules to Solve the Mathematical Expressions by Approximation

Rule 1:

To solve complex problems, take the closest value of the number given in the expression. for example, 77.8 is round off to 78;

33.02 is round off to 33 etc.

EX1:  19%of (399.88/20X400)+30=?

          20/100x(400/20×400)+30=?

          1/5x(8000)+30=1600+30=1630

Rule 2:

To solve problems with large numbers involved in multiplication, we can consider the approximate value of the large numbers by increasing or decreasing the round off values making the computation easy. for example, 239×111 is approximated to 240×110.

EX2: 192×397+560×5/7+729.80=?

         192×397+560×5/7+730=?

         190×400+400+730=76000+1130=77130

Rule 3:

To solve problems with large numbers involved in the division, we can consider the approximate value of the large numbers by increasing or decreasing the round off values making the computation easy. for example, 6198.36/38.69 is approximated as 6200/40.

EX3:862.5/18.64=?

        860/20=43

Approximation is a mathematical process that involves finding an estimate or approximation of a given value or expression. It is a valuable skill, particularly in Quantitative Aptitude tests, and is frequently used in competitive exams such as the SBI Clerk Mains, UPSC, PSC, and Railways. In fact, up to 10% of the total marks in these examinations may be dedicated to approximation questions. These questions are typically straightforward and can be solved quickly with a bit of practice. This article will provide an overview of approximation questions, their importance in competitive exams, and some tips and tricks for tackling them successfully. By the end of this article, you’ll have a better understanding of how to approach approximation questions and improve your chances of success in these exams.

Practice Quiz: 

Practice Approximation Aptitude Quiz Questions