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Formula Sheet

Ratio and Proportion — Formula Sheet

ICSE · Class 7 · Mathematics

14 formulas from Ratio and Proportion (ICSE Class 7 Mathematics) on one page, grouped by topic. Part of the ICSE Class 7 Mathematics syllabus.

52 questions24 flashcards14 formulas & key relations5 concepts

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14 Entries · 4 Sections

Formulas and Key Relations

Ratio

a : b = a/b

6 : 8 = (6 ÷ 2) : (8 ÷ 2) = 3 : 4

3 : 4 = 3/4

If each term of a ratio is multiplied or divided by the same non-zero number, the ratio remains the same.

Sharing in a Ratio

Share = (part of ratio / total parts) × total quantity

2 : 3 => total parts = 2 + 3 = 5

Proportion

When four quantities are so related that the ratio between the first and the second quantities is equal to the ratio between the third and the fourth

Product of extremes = Product of means

3 : 4 = 18 : x => 3 × x = 4 × 18

12 : 30 = 30 : x => 12 × x = 30 × 30

Continued Proportion

a : b = b : c

b^2 = ac

b = sqrt(ac)

a : b and b : c to a : c = (a/b) × (b/c) = a/c

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Frequently Asked Questions

What are the important topics in Ratio and Proportion for ICSE Class 7 Mathematics?
Key topics in Ratio and Proportion include Ratio: Meaning, Terms, and Simplest Form, Converting Fractional Ratios and Sharing in a Ratio, Ratio Problems Using L.C.M., H.C.F., and Unitary Method, Proportion, Extremes, Means, and Fourth Proportional. Study these first, then practise questions on each for Class 7 exams.
How many formulas are in Ratio and Proportion?
This sheet lists 14 formulas from Ratio and Proportion, grouped by topic. Learn what each symbol stands for so you can apply the formula, not just recall it.
How should I revise Ratio and Proportion for Class 7 exams?
Learn the core ideas first, then work through the 52 practice questions on Ratio and Proportion. 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 Ratio and Proportion

All ICSE Class 7 Mathematics Formula Sheet

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