First of all we should remember some key points to solve number systems questions in banking & other competitive exams. These key points are prepare all the basic concepts like classifications of number system, divisibility rules ,
bodmas rule, LCM HCF , and all .

Then we should start practise to solve the questions but in this chapter the main problem creates the complex calculations of two , three and four digits numbers.
In general many exams are avoid to ask over complex digit numbers calculations so we need to only practise for maximum 4 and 5 digit numbers calculations.

For this we should have to learn tables minimum from 1 to 25 & squares , cubes & its roots .
Then we can solve the questions of this chapter very easily and we get selected for job.

    AshishSrivastava In my opinion RS Aggarwals book named “Qauntitative aptitude” is the best..it has sufficient number of questions..

      6 days later