Number System — Study Plan
CAT · Quantitative Aptitude
Step-by-step Number System study plan for CAT Quantitative Aptitude 2026 — structured month-wise approach to mastering this chapter.
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A structured approach to studying Number System for CAT Quantitative Aptitude.
Study Plan for Number System
Day 1–2: Learn the Theory
Study the chapter thoroughly. Note down definitions, formulas, and key concepts.
Day 3: Practice Problems
Solve practice questions and previous year CAT problems. There are 67 questions available for this chapter.
Day 4: Revise & Test
Revise key formulas and concepts without looking at notes. Take a practice quiz to test your understanding.
What to Focus On
- Natural numbers start from 1 and are used for counting
- Prime number 2 is the only even prime number
- Zero is neither positive nor negative
- Only need to check divisibility up to the square root of a number
- 2 is the only even prime number
- Prime numbers > 3 follow the pattern 6n ± 1
- Divisibility rules save time in calculations and problem-solving
- For composite divisors, check divisibility by their prime factors
- The rule for 11 uses alternating sum of digits
Common Mistakes to Avoid
When checking if a number is prime, you must test divisibility with all numbers below it
LCM is always found by multiplying the prime factors to their highest powers, and this method works fastest for all numbers
In remainder problems, you must always use positive remainders and cannot use negative remainders
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