Which Mathematics topics matter most for RRB NTPC?

Percentage, Profit & Loss carry the highest question counts based on previous-year analyses.

Is this Mathematics material free?

Yes — every chapter, practice set and flashcard deck here is free. Premium mock tests and live courses from tutors are labelled separately.

RRB NTPCMathematics

Mathematics for RRB NTPC

30 questions, 4 options each — Percentage and Profit & Loss are the heaviest topics.

📊 30 Q · 30 marks (30% of CBT 1)

How toppers play this section

RRB NTPC's Mathematics stays at a 10th-standard level throughout — no question demands more than a clean, memorised formula applied carefully under a tight per-question time budget. Percentage and Profit & Loss are tied as the single heaviest topics, and both build directly on the same successive-percentage-change logic. Time & Work, Time & Distance and Simple & Compound Interest form a closely-weighted middle tier, each rewarding a specific shortcut (rate-addition, the km/h-to-m/s conversion, the CI−SI 2-year difference) over slower first-principles derivation. Number System, Decimals & Fractions and LCM/HCF are the fastest points on the paper once their rules are automatic, while Geometry & Trigonometry and Elementary Statistics stay deliberately basic — standard-angle trig and the four core statistical measures, nothing more.

Chapters

Built to the RRB NTPC blueprint — notes, shortcuts, solved PYQ-style examples and practice in every chapter.

1Number SystemNumber System questions in RRB NTPC CBT 1 are short and fact-based — place value, divisibility, unit digits, and simplification. They reward a candidate who knows one rule cold over one who starts computing from scratch.⏱ 10 min read

2Decimals & FractionsDecimals and fractions questions test one core skill — converting cleanly between the two forms and comparing values that look different but may not be. A wrong common denominator or a misplaced decimal point is the entire failure mode here.⏱ 8 min read

3LCM & HCFLCM and HCF questions reward one thing above all else — correctly identifying which of the two the word problem actually needs. The computation itself, once you know which one to find, is mechanical.⏱ 8 min read

4Ratio & ProportionRatio and proportion questions are almost always a disguised division problem — split a total into parts, or scale one quantity against another. The one recurring trap is direct versus inverse proportion, which pull in opposite directions.⏱ 8 min read

5PercentagePercentage is Mathematics's single most-weighted topic in CBT 1, and it's also the foundation underneath Profit & Loss and Simple/Compound Interest elsewhere in the paper — the base of a percentage calculation is where nearly every error happens.⏱ 9 min read

6MensurationMensuration is a formula-recall topic above all else — every question is a direct or lightly-disguised application of an area, perimeter, or volume formula. The only real skill is keeping the formula list correct and matching the right shape to the right formula.⏱ 9 min read

7Time & WorkTime and Work has exactly one core idea — convert every "days to finish" statement into a work rate, then add or subtract rates. Every variation (efficiency, partial work, someone leaving midway) is this same idea applied once more.⏱ 9 min read

8Time & DistanceTime and Distance runs on one formula — speed = distance/time — applied to trains, boats, and catching-up problems. The unit conversion between km/h and m/s is the single most common source of error.⏱ 9 min read

9Simple & Compound InterestSimple interest grows the same amount every year on the original principal; compound interest grows on an ever-increasing base. Confusing the two — or applying the wrong formula — is the single most common error in this topic.⏱ 9 min read

10Profit & LossProfit and Loss is percentage change applied to buying and selling prices. The recurring trap is a markup followed by a discount — the two percentages never simply cancel out.⏱ 9 min read

11AlgebraRRB NTPC's algebra stays at a basic level — linear equations, simple quadratics, standard identities, and age-based word problems. The identities are worth memorising cold since they replace slower direct substitution.⏱ 9 min read

12Geometry & TrigonometryRRB NTPC's geometry stays at basic angle and triangle properties, and trigonometry stays limited to the three standard angles (30°, 45°, 60°) applied to simple heights-and-distances problems. Nothing here requires calculus-level trigonometry.⏱ 9 min read

13Elementary StatisticsElementary Statistics stays at mean, median, mode, and range — four definitions applied carefully to a list of numbers. The recurring trap is treating "sum unchanged" problems (replacing one value) as harder than they are.⏱ 7 min read

Topic-wise weightage in RRB NTPC

Expected question counts from previous-year paper analyses. Topics with an arrow already have a full chapter.

Topic	CBT 1 — Mathematics, Reasoning, GA Q	Priority
Number System	~2-3	Medium
Decimals & Fractions	~1-2	Medium
LCM & HCF	~1-2	Medium
Ratio & Proportion	~2	High
Percentage	~3	Very high
Mensuration	~2-3	High
Time & Work	~2-3	High
Time & Distance	~2-3	High
Simple & Compound Interest	~2-3	High
Profit & Loss	~3	Very high
Algebra	~2-3	Medium
Geometry & Trigonometry	~2	Medium
Elementary Statistics	~1-2	Medium