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ICSE Class 9 Mathematics — Formula Sheet

ICSE Class 9 Mathematics formula sheet, chapter by chapter — 301 formulas across 26 chapters. Follows the ICSE / ISC syllabus.

How to Use the Formula Sheet

  1. Write, don't just read — writing each formula out helps it stick.
  2. Understand the derivation — you can rebuild a formula you half-remember.
  3. Group related formulas — link the ones that build on each other.
  4. Test yourself — cover the sheet and write the formulas from memory.

Chapter-Wise Formulas — 26 Chapters

1

Rational and Irrational Numbers

13 entries
Q = {a/b : a, b ∈ Z, b ≠ 0}
R = Q ∪ Q̄
a/b = c/d ⇔ a × d = b × c
a/b > c/d ⇔ a × d > b × c
d = (y - x)/(n + 1)
The full Rational and Irrational Numbers formula sheet
2

Compound Interest (Without Using Formula)

10 entries
A = P + I
I = (P × R × T)/100
C.I. = A - P
C.I.(next period) = C.I.(current period) + Interest for one period on C.I.(current period)
Amount(next period) = Amount(current period) + Interest on Amount(current period) for one period
The full Compound Interest (Without Using Formula) formula sheet
3

Compound Interest (Using Formula)

4 entries
A = P(1 + r/100)^n
C.I. = P[(1 + r/100)^n - 1]
When the rate changes from year to year, the amount is found by A=P(1+r1/100)(1+r2/100)(1+r3/100)...
For interest compounded half-yearly, the formula is A=P(1+r/(2×100))^(n×2).
The full Compound Interest (Using Formula) formula sheet

23 more chapters below

Formula sheets for all 26 chapters with formulas.

Get the Formula Sheets

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Frequently Asked Questions

Where can I find ICSE Class 9 Mathematics Formula Sheet?

This page has formula sheet for 26 chapters of ICSE Class 9 Mathematics for the 2026-27 session. Each chapter links to its own page with the full set.

Go through the syllabus first, then work chapter by chapter: learn the ideas, practise questions, and revise with notes and flashcards. Leave time at the end to revise every chapter once more under timed conditions.

Learn the formulas you use most first, and understand what each symbol means so you can apply them. Knowing where a formula comes from helps you rebuild it if you forget it in the exam.

Browse Formula Sheet by Chapter

26 chapters

1

Rational and Irrational Numbers

2

Compound Interest (Without Using Formula)

3

Compound Interest (Using Formula)

4

Expansions

5

Factorisation

6

Simultaneous (Linear) Equations

7

Indices

8

Logarithms

9

Triangles

10

Isosceles Triangles

11

Inequalities

12

Mid-Point and Its Converse

13

Pythagoras Theorem

15

Construction of Polygons

16

Area Theorems

17

Circle

19

Mean and Median

20

Area and Perimeter of Plane Figures

21

Solids

22

Trigonometrical Ratios

23

Trigonometrical Ratios of Standard Angles

24

Solution Of Right Triangles

25

Complementary Angles

26

Co-ordinate Geometry

27

Graphical Solution

28

Distance Formula

More Mathematics Resources

ICSE Class 9

Practice Quiz

Test yourself with quick quizzes

Important Questions

Exam-style questions with answers

Revision Notes

Key concepts and quick revision points

Chapter Summary

Understand each chapter at a glance

Concept Maps

Diagrams showing how topics connect

Study Plan

Week-by-week preparation schedule

Flashcards

Quick-fire cards for active recall practice

Syllabus

Chapter list and the topics in each

Other ICSE Class 9 Subjects

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