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Ratio and Proportion

ICSE · Class 7 · Mathematics

Quick revision notes for Ratio and Proportion — ICSE Class 7 Mathematics. Key concepts, formulas, and definitions for last-minute revision.

52 questions24 flashcards5 concepts

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Key Topics to Revise

1

1. Ratio: Meaning, Terms, and Simplest Form

  • A ratio is a relationship between two quantities of the same kind with the same unit.
  • The symbol of ratio is : .
  • The ratio 3:4 can also be written as the fraction 3/4.
2

2. Converting Fractional Ratios and Sharing in a Ratio

  • A fractional ratio can be converted into whole numbers by multiplying each term by the L.C.M. of the denominators.
  • If each term of a ratio is multiplied or divided by the same non-zero number, the ratio remains the same.
  • For example, (1/3):(1/4) becomes 4:3 after multiplying both terms by 12.
3

3. Ratio Problems Using L.C.M., H.C.F., and Unitary Method

  • If two numbers are in the ratio 4:5, they can be written as 4x and 5x.
  • The L.C.M. of 4x and 5x is 20x.
  • If two numbers are in the ratio 3:4, their H.C.F. is x when the numbers are 3x and 4x.
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4. Proportion, Extremes, Means, and Fourth Proportional

  • 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 quantities, they are said to be in proportion.
  • Proportion is equality of two ratios.
  • A proportion can be written with = or with :: .

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Full Notes

Key Concepts

A ratio is a relationship betweenIn the ratio 3A ratio is in simplest formA ratio with fractions can beIf a quantity is divided

Frequently Asked Questions

What are the important topics in Ratio and Proportion for ICSE Class 7 Mathematics?
Ratio and Proportion covers several key topics that are frequently asked in ICSE Class 7 board exams. Focus on the core concepts listed on this page and practise related questions to build confidence.
How to score full marks in Ratio and Proportion — ICSE Class 7 Mathematics?
Understand the core concepts first, then work through the 52 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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