← Reading Room
A complete SSC/RRB-ready study book on the Number System: classification of numbers, divisibility-linked tests, cyclicity, factors, HCF-LCM, remainders, surds and indices, base conversion, number series, worked examples, tricks, and a full 20+30 MCQ practice set with solutions.
Chapters
11. Introduction22. Classification of Numbers3Solved Examples43. Place Value and Face Value5Solved Examples64. Tests of Divisibility7Solved Examples85. Finding the Unit Digit of Powers (Cyclicity Method)9Cyclicity Table (unit digit of baseⁿ, n = 1, 2, 3, 4, …)10Solved Examples116. Number of Factors and Sum of Factors12Solved Examples137. HCF and LCM14Method 1: Prime Factorization15Method 2: Division Method (Euclid’s Algorithm) — for HCF of two numbers16Key Relationship17HCF and LCM of Fractions18Solved Examples198. Remainders and Modular Arithmetic Shortcuts20Solved Examples219. Finding the Last Two Digits of Powers22Solved Examples2310. Surds and Indices — Basics24Solved Examples2511. Base Conversion Basics26Solved Examples2712. Number Series Basics28Solved Examples2913. Shortcuts and Speed Tricks3014. Common Mistakes Aspirants Make3115. Practice Question Set A — Basic Level3216. Practice Question Set B — Moderate / Exam Level33Set A Solutions34Set B Solutions