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Mathematics for Group D

Number system, BODMAS, LCM and HCF, fractions, percentages, ratio, averages, profit and loss, interest, time and work, speed, ages, algebra, geometry, mensuration, trigonometry and basic statistics. It is 25 questions in the CBT.

8 guides·Conducted by Railway Recruitment BoardsOfficial website

Study in this order

  1. 1A maths plan for RRB Group DTwenty-five maths questions in RRB Group D, most of them school-level arithmetic. The topics that matter most, a six-week order, a daily 60-minute routine, the tables and fraction–percentage pairs that save seconds, worked examples and a practice set. 6 min read
  2. 2Number system for RRB Group DDivisibility, unit digits, factors, remainders and sums. Number system questions are short and easy once you know the rules. The rules explained simply, with step-by-step worked examples and a practice set with solutions. 6 min read
  3. 3BODMAS and simplification for RRB Group DSimplification questions look easy, which is why so many candidates lose marks on them. One step done in the wrong order gives a wrong answer that is usually among the options. The BODMAS rule, the "of" trap, nested brackets, quick multiplication tricks, and practice with solutions. 5 min read
  4. 4LCM and HCF for RRB Group DWhen will three runners meet again at the start? What is the longest rope that measures three lengths exactly? LCM and HCF questions follow a handful of patterns. How to find each, how to tell which one the question wants, remainder problems, and practice with solutions. 6 min read
  5. 5Decimals and fractions for RRB Group DWhich is bigger, 5/8 or 7/12? What is 0.2727… as a fraction? Decimal and fraction questions are quick marks if you can convert and compare fast. Operations, recurring decimals, comparing, word problems and practice with solutions. 5 min read
  6. 6Percentage for RRB Group DPercentage sits behind profit and loss, interest, averages and data questions. Learn it well and much of the maths section gets easier. Core methods, the fraction table, successive change, "more than, less than" problems, pass–fail marks and elections, with practice. 5 min read
  7. 7Ratio and proportion for RRB Group DSharing money in a ratio, joining two ratios, finding a fourth or mean proportional, coins in a bag. Ratio questions in RRB Group D follow simple patterns. Think in "parts" and they become easy. Methods, worked examples and practice with solutions. 6 min read
  8. 8Averages for RRB Group DA new member joins, a mark was copied wrongly, a person is replaced, two classes are combined. Average questions look different but all use one idea, total = average × number. The method, shortcuts, worked examples and practice with solutions. 5 min read

New Mathematics guides are added regularly. Back to all Group D guides