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Formula Sheet

Proportional Reasoning-1

CBSE · Class 8 · Mathematics

All formulas from Proportional Reasoning-1 in CBSE Class 8 Mathematics. Key equations, constants, and identities for board exam preparation.

55 questions60 flashcards5 concepts

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14 Formulas · 4 Sections

Formulas

Similarity and Proportionality

60 : 40

30 : 20

90 : 60

a : b :: c : d

Finding Simplest Form

Divide both terms by HCF

60 ÷ 20 : 40 ÷ 20 = 3 : 2

90 ÷ 30 : 60 ÷ 30 = 3 : 2

Proportional Reasoning and Cross Multiplication

c = fa

d = fb

f = c/a and f = d/b

c/a = d/b

bc = ad or ad = bc

Rule of Three and Āryabhaṭa

pramāṇa × ichchhāphala = phala × ichchhā

Multiply the phala by the ichchhā and divide the resulting product by the pramāṇa.

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Frequently Asked Questions

What are the important topics in Proportional Reasoning-1 for CBSE Class 8 Mathematics?
Proportional Reasoning-1 covers several key topics that are frequently asked in CBSE Class 8 board exams. Focus on the core concepts listed on this page and practise related questions to build confidence.
How to score full marks in Proportional Reasoning-1 — CBSE Class 8 Mathematics?
Understand the core concepts first, then work through the 55 practice questions available for this chapter. Revise formulas and 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.

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