Simplification is one of the most scoring topics of the quant section in RRB PO Exam. In Prelims, simplification contributes to 8-10 marks. It is a topic that requires fast calculation skills and a strong hold on concepts such as percentage-fraction conversion, as they are frequently used topics. To make a strong hold over this concept, you need to do a lot of practice. To help you with the same, we have come up with a PDF that contains 50+ exam-level simplification questions for you to practice and ace the exam.
Download 50+Simplification Questions for RRB PO Exam 2025
In this section, we are providing 50+ Simplification questions for the RRB PO Exam 2025. These are curated by our experts after analysing previous years’ patterns. Download Now and practice as many questions as you can.
Concepts used to Solve Simplification Questions
In this section, we are providing a list of concepts that you need while doing calculations. Using these concepts while solving the questions enhances the chances of accuracy and speed as well. The topics are listed below-
BODMAS Rule (Brackets, Order, Division, Multiplication, Addition, Subtraction)
It defines the correct sequence to perform mathematical operations. Always solve expressions step by step, following this order to get accurate results.
Approximation-based problems
These questions require rounding off numbers to the nearest value for faster calculation. The goal is to find a value close enough to the exact answer within reasonable accuracy.
Fractions and Decimals
Fractions represent parts of a whole, while decimals express the same in base-10 form. Converting between them helps simplify arithmetic operations quickly.
Square and Cube Roots
These help in simplifying numbers raised to powers. Memorising square and cube values up to at least 30 and 20, respectively, boosts speed in calculations.
Percentage-based simplifications
These involve converting percentages into fractional or decimal forms for quick solving. They often appear in profit-loss, interest, and ratio-related questions.
Surds and Indices
Surds deal with irrational roots (like √2, √3), while indices represent powers or exponents. Understanding their laws helps simplify expressions involving roots and powers efficiently.
Quick Calculation Shortcuts For Simplification
| Fraction | Equivalent Percentage |
| 1/2 | 50% |
| 1/3 | 33.33% |
| 2/3 | 66.67% |
| 1/4 | 25% |
| 3/4 | 75% |
| 1/5 | 20% |
| 2/5 | 40% |
| 3/5 | 60% |
| 4/5 | 80% |
| 1/6 | 16.67% |
| 5/6 | 83.33% |
| 1/7 | 14.28% |
| 2/7 | 28.57% |
| 3/7 | 42.86% |
| 4/7 | 57.14% |
| 5/7 | 71.43% |
| 6/7 | 85.71% |
| 1/8 | 12.5% |
| 3/8 | 37.5% |
| 5/8 | 62.5% |
| 7/8 | 87.5% |
| 1/9 | 11.11% |
| 2/9 | 22.22% |
| 4/9 | 44.44% |
| 5/9 | 55.55% |
| 7/9 | 77.77% |
| 8/9 | 88.88% |
| 1/10 | 10% |
| 3/10 | 30% |
| 7/10 | 70% |
Squares, Square Roots & Cube Roots Table
| Number | Square (n²) | Square Root (√n) | Cube (n³) | Cube Root (∛n) |
| 1 | 1 | 1 | 1 | 1 |
| 2 | 4 | 1.414 | 8 | 1.26 |
| 3 | 9 | 1.732 | 27 | 1.44 |
| 4 | 16 | 2 | 64 | 1.59 |
| 5 | 25 | 2.236 | 125 | 1.71 |
| 6 | 36 | 2.449 | 216 | 1.82 |
| 7 | 49 | 2.646 | 343 | 1.91 |
| 8 | 64 | 2.828 | 512 | 2 |
| 9 | 81 | 3 | 729 | 2.08 |
| 10 | 100 | 3.162 | 1000 | 2.15 |
| 11 | 121 | 3.317 | 1331 | 2.22 |
| 12 | 144 | 3.464 | 1728 | 2.29 |
| 13 | 169 | 3.606 | 2197 | 2.35 |
| 14 | 196 | 3.742 | 2744 | 2.41 |
| 15 | 225 | 3.873 | 3375 | 2.47 |
| 16 | 256 | 4 | 4096 | 2.52 |
| 17 | 289 | 4.123 | 4913 | 2.57 |
| 18 | 324 | 4.243 | 5832 | 2.62 |
| 19 | 361 | 4.358 | 6859 | 2.67 |
| 20 | 400 | 4.472 | 8000 | 2.71 |
| 25 | 625 | 5 | 15625 | 2.92 |
| 30 | 900 | 5.477 | 27000 | 3.11 |
Common Types of Simplification Questions
In this section, we have discussed the common types of simplification questions that have been asked in the examination.
- Pure BODMAS Type:
Example: 15 + {12 × (8 – 6)} ÷ 3
→ 15 + (12 × 2) ÷ 3 = 15 + 24 ÷ 3 = 23 - Mixed Fractions:
Example: ¾ of 120 + ⅖ of 50
→ 90 + 20 = 110 - Square/Cube Roots:
Example: √144 + ∛27 = 12 + 3 = 15 - Percentage-based:
Example: 20% of 240 + 25% of 320 = 48 + 80 = 128 - Approximation-based:
Example: 49.8 × 2.02 ≈ 50 × 2 = 100
Approach to Solve Simplification Questions in RRB PO Exam 2025
The way or approach you use while solving the questions is very important, as it decides whether you’ll be able to solve the questions and get accurate results or not.
1. Understand the BODMAS Rule
Always perform operations in the correct order:
Brackets → Orders → Division → Multiplication → Addition → Subtraction.
Ignoring this sequence leads to calculation errors.
2. Learn Square and Cube Values
Memorise squares up to 30 and cubes up to 20. It helps simplify large expressions faster without using rough work.
3. Master Fractions and Percentages
Keep common conversions handy:
- ½ = 50%, ¼ = 25%, ⅓ = 33.33%, ⅕ = 20%, etc.
This allows quick estimation when questions mix fractions and percentages.
4. Approximate When Needed
In approximation-type questions, focus on rounding off numbers smartly. For instance, instead of calculating 49.9 × 20.1, approximate it to 50 × 20 = 1000.
Conclusion
In this article, we have explained all the concepts and calculation tables for reference while solving the simplification problems. We have also provided a table that contains 50+ simplification questions for the RRB PO 2025 Exam. Use the PDF to make yourself exam-ready. To solve questions from more such topics, you can buy our test series, where you can reattempt the full-length mock tests and get a Detailed Comparison with the Topper, compare your Time, Score, Accuracy, Correct/Wrong Answers, and even the Average Performance side-by-side.
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