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RRB Group D Number System & Simplification Questions
Practise number system & simplification (quantitative aptitude) for the RRB Level 1 (Group D) Examination: 10 multiple-choice questions, each with the correct answer and a worked explanation. Click an option to check it, or “New questions” for another set.
Number System & Simplification practice
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Q1.Find the next number in the series: 1, 2, 4, 8, 16, ?
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Answer: A — 32
Each term is multiplied by 2.
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Q2.What is √7,396?
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Answer: B — 86
86 × 86 = 7396, so √7396 = 86.
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Q3.Find the next number in the series: 49, 64, 81, 100, 121, ?
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Answer: C — 144
Squares of consecutive numbers: 7², 8², … → 12² = 144.
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Q4.Find the next number in the series: 24, 38, 52, 66, 80, ?
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Answer: A — 94
Each term increases by 14.
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Q5.Simplify: 17 + 2 × 6 − 42
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Answer: B — -13
BODMAS: multiply first — 2 × 6 = 12; then 17 + 12 − 42 = -13.
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Q6.Simplify: 40 + 7 × 2 − 46
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Answer: D — 8
BODMAS: multiply first — 7 × 2 = 14; then 40 + 14 − 46 = 8.
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Q7.What is √9,025?
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Answer: C — 95
95 × 95 = 9025, so √9025 = 95.
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Q8.What is √2,500?
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Answer: D — 50
50 × 50 = 2500, so √2500 = 50.
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Q9.Simplify: 64 + 10 × 8 − 46
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Answer: B — 98
BODMAS: multiply first — 10 × 8 = 80; then 64 + 80 − 46 = 98.
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Q10.Find the next number in the series: 10, 12, 16, 22, 30, ?
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Answer: D — 40
Differences are 2, 4, 6, 8 → next difference 10.
How to approach number system & simplification questions
Learn squares to 30 and cubes to 15, apply BODMAS strictly, and use HCF × LCM = product of two numbers. For series, check the differences first, then the ratios.
About RRB Group D
RRB Level 1 (Group D) Examination — conducted by Railway Recruitment Boards (RRB). Recruits track maintainers, helpers and assistants; general science carries significant weight.
Original practice questions written for this site in the style and difficulty of each exam’s syllabus. They are not past papers and the site is not affiliated with any exam body. Exam patterns, marking schemes and syllabi change — always check the latest official notification.
RRB Group D practice topics
| Topic | Section | Question source |
|---|---|---|
| Number System & Simplification | Quantitative aptitude | Calculated (new numbers every set) |
| Percentages | Quantitative aptitude | Calculated (new numbers every set) |
| Logical Reasoning | Reasoning | Calculated (new numbers every set) |
| Physics | Science | Calculated + question bank |
| Chemistry | Science | Calculated + question bank |
| Biology | Science | Question bank |
| Indian Polity, History & Geography | General awareness | Question bank |