Most Important Approximation Questions for IBPS RRB PO 2025 Exam

Approximation is one of the fastest and most scoring topics in the Quantitative Aptitude section of RRB PO Prelims. By simplifying calculations using BODMAS, rounding numbers, and applying quick arithmetic shortcuts, candidates can secure 5–6 marks in just 2 minutes. With predictable patterns and basic calculations, this topic is a reliable way to boost your Quant score.

Most Important Approximation Questions for IBPS RRB PO

Approximation questions generally revolve around simplifying expressions using BODMAS, rounding off numbers, applying percentage shortcuts, and evaluating simple arithmetic patterns. These questions test your ability to make smart, quick estimations without exact calculations which is why they are among the fastest-to-solve scoring sets in the Quant section.

Directions (21-25): What approximate value should come in place of question (?) mark in the following questions.
Q1. ³√? + 540 = 510 ÷ 797 × 851
(a) 216
(b) 512
(c) 125
(d) 343
(e) 64

Q2. ?² = 19 × 41 ÷ 126 × 35 + 19 × 6
(a) 12
(b) 18
(c) 16
(d) 15
(e) 14

Q3. (? – 108) + 11% of (1250) = (22.29)²
(a) 350
(b) 400
(c) 450
(d) 500
(e) 590

Q4. 841÷ 140 + 1440 ÷ 11/10 + 20 = ?
(a) 1226
(b) 1052
(c) 1469
(d) 1531
(e) 1621

Q5. 11.95² + 31.988² − 12.9³ + 40² =?

(a) 592
(b) 563
(c) 551
(d) 571
(e) 536

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Approximation Questions Weightage Marks in Quantitative Section

Out of 40 quantitative questions, Approximation alone contributes 5–6 marks, and these marks can be secured in under 2 minutes with the right preparation. What makes this topic powerful is its predictability: the patterns remain similar every year, and the calculations rely on basic arithmetic.

Tips to Solve Approximation Questions for IBPS RRB PO

Approximation can become one of the easiest ways to score in the Quantitative Aptitude section if approached strategically. Follow these tips to maximize your marks:

• Revise BODMAS thoroughly – Most questions become simple once you apply the correct order of operations.
• Use rounding smartly – Convert complex numbers into simpler, close values while keeping your answer within an acceptable range.
• Strengthen quick maths – Memorize squares, cubes, and percentage–fraction equivalents to save time during calculations.
• Avoid unnecessary calculations – Approximation is about estimating, not solving exactly. Focus on simplification wherever possible.
• Practice daily timed quizzes – Regular practice helps you attempt all 5–6 Approximation questions in under 90 seconds confidently.