CA Foundation Paper 3: Quantitative Aptitude Maths & Stats — How to Score 50+
Why Paper 3 Is Your Secret Weapon
Paper 3 (Quantitative Aptitude) is fully objective — 100 MCQs worth 100 marks. This means there is no subjectivity in evaluation, and if you prepare smartly, you can score very high. The paper is split into two parts: Business Mathematics & Logical Reasoning (60 marks) and Statistics (40 marks).
Part A: Business Mathematics & Logical Reasoning (60 Marks)
Ratio and Proportion, Indices, Logarithms
These are fundamental chapters. They appear directly and also support other chapters like interest and equations. Master the properties of logarithms and indices first — they save time in calculations.
Equations and Matrices
Linear and quadratic equations are straightforward if you practise enough. Matrices (addition, multiplication, determinants, inverse) carry easy marks — learn the formulas and apply them mechanically.
Simple & Compound Interest, Annuities
Interest and annuity problems are very formulaic. Memorise the formulas, understand the difference between ordinary and due annuities, and practice with a calculator. These questions are quick to solve.
Permutations, Combinations & Probability
These chapters require conceptual understanding. Learn to identify whether a problem is P or C. For probability, focus on addition and multiplication rules, conditional probability, and Bayes theorem.
Logical Reasoning
Number series, direction tests, coding-decoding, and analogies appear here. These questions are quick if you have practised patterns. Dedicate 30 minutes daily to logical reasoning puzzles.
Part B: Statistics (40 Marks)
Measures of Central Tendency & Dispersion
Mean, median, mode, standard deviation, and coefficient of variation are tested every exam. Learn both direct and shortcut methods. Dispersion questions often carry 4-5 marks each.
Correlation & Regression
Karl Pearson correlation, Spearman rank correlation, and regression equations are high-yield. These are formula-based and scoring if you practice the computation steps.
Index Numbers & Time Series
Index numbers (Laspeyres, Paasche, Fisher) and time series analysis (trend by moving average and least squares) are predictable and scoring.
MCQ Strategy for Paper 3
Calculator Tips
The ICAI-approved calculator (12-digit, non-programmable) is your best friend in Paper 3. Practice using memory functions (M+, M-, MR) for multi-step calculations. This saves significant time.
Practice on CA Saarthi
CA Saarthi has hundreds of MCQs for every Paper 3 topic, categorised by difficulty. Our mock tests simulate the real exam environment with timer and negative marking. Start your free practice today.
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