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Formula Sheet

Rational Number — Formula Sheet

ICSE · Class 8 · Mathematics

9 formulas from Rational Number (ICSE Class 8 Mathematics) on one page, grouped by topic. Part of the ICSE Class 8 Mathematics syllabus.

38 questions28 flashcards9 formulas & key relations5 concepts

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A nested Venn diagram illustrating the relationships between natural numbers (N), integers (Z), rational numbers (Q), and real numbers (R) as subsets of each other.
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9 Entries · 5 Sections

Formulas and Key Relations

Core definitions and sets

p/q where p, q are integers and q ≠ 0

0 = 0/1

Signs, equivalent forms, and standard form

p/q = (p × m)/(q × m) = (p ÷ m)/(q ÷ m)

a/b = c/d ⇒ a × d = b × c

Operations on rational numbers

a/b + (-a/b) = 0

a/b × b/a = 1

(a/b) × (c/d + e/f) = (a/b × c/d) + (a/b × e/f)

Division of rational numbers

a/b ÷ c/d = a/b × d/c

Key relations

If a/b = c/d, then a×d = b×c, where b and d are not zero.

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Frequently Asked Questions

What are the important topics in Rational Number for ICSE Class 8 Mathematics?
Key topics in Rational Number include Meaning of Rational Numbers, Standard Form and Equivalent Rational Numbers, Addition and Subtraction of Rational Numbers, Multiplication and Division of Rational Numbers. Study these first, then practise questions on each for Class 8 exams.
How many formulas are in Rational Number?
This sheet lists 9 formulas from Rational Number, grouped by topic. Learn what each symbol stands for so you can apply the formula, not just recall it.
How should I revise Rational Number for Class 8 exams?
Learn the core ideas first, then work through the 38 practice questions on Rational Number. Revise definitions regularly and use flashcards for quick recall before the exam.

Sources & Official References

Content is aligned to the official syllabus. Refer to the board website for the latest curriculum.

More resources for Rational Number

All ICSE Class 8 Mathematics Formula Sheet

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