Quantitative Aptitude Checklist: High-Weightage Chapters for SSC GD Constable

The SSC GD Constable examination requires a distinct approach compared to graduate-level tests. Here, the Quantitative Aptitude section focuses primarily on Core Arithmetic and Commercial Mathematics, testing your ability to solve everyday computational problems quickly and accurately. If you are aiming for a top score, make sure you have thoroughly mastered every item on this essential topic checklist.

1. Number Systems and Simplification

• Full mastery of BODMAS operational precedence rules.
• Rapid application of divisibility rules (especially for 3, 7, 9, and 11) to quickly eliminate incorrect options.
• Finding the LCM and HCF of fractions and decimals, along with their application in time-and-distance problems.

2. Percentages, Profit, Loss, and Discount

• Instant conversion between percentages and fractions (16.66% = 1/6, 20% = 1/5).
• Solving multi-step profit and loss scenarios, including problems involving dishonest dealers or successive discount rates.
• Calculating marked price (MP), cost price (CP), and selling price (SP) using direct ratio setups:
  MP / CP = (100 + Profit %) / (100 - Discount %)

3. Ratio, Proportion, and Partnership

• Balancing combined ratios (e.g., finding A:B:C given A:B and B:C).
• Solving age-related word problems and proportional distributions.
• Calculating partnership profit distributions based on capital investment amounts multiplied by investment durations.

4. Time, Work, and Pipe Systems

• Using the Total Work Efficiency Method (LCM of time periods) instead of slow, fractional calculations.
  Worker A = 10 Days ───┐ ├──> Total Work (LCM) = 30 Units ──> Efficiency A = 3 Units/Day Worker B = 15 Days ───┘ ──> Efficiency B = 2 Units/Day Combined Daily Output = 5 Units/Day ──> Total Time Required = 30 / 5 = 6 Days
• Applying the work-equivalence equation to solve problems involving varying team sizes:
  (M₁ × D₁ × H₁) / W₁ = (M₂ × D₂ × H₂) / W₂

5. Simple and Compound Interest

• Calculating simple interest variations when principal inputs change over time.
• Mastering effective percentage rates for two-year and three-year compound interest calculations to avoid tedious multiplication loops.