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Percent and Percentage — Revision Notes

ICSE · Class 8 · Mathematics

Percent and Percentage revision notes for ICSE Class 8 Mathematics: 4 topics in quick points. Part of the ICSE Class 8 Mathematics syllabus.

82 questions24 flashcards7 formulas & key relations5 concepts

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Key Topics to Revise

1

1. Core Meaning and Basic Conversions

  • Percent means for every hundred and is written as % or p.c.
  • A percentage is a fraction whose denominator is 100.
  • The numerator of a percentage is called the rate percent.
2

2. Finding Percent, Whole, and Part

  • Direct method finds percent directly using part ÷ whole × 100%.
  • Alternative method often sets x% of a value equal to the given part.
  • The same problem can often be solved in more than one valid way.
3

3. Percentage Increase, Decrease, and Change

  • Increase % and decrease % are based on the original quantity.
  • Percentage change is change on 100, always measured relative to the original value.
  • If a number is decreased by x%, the new number equals (100 - x)/100 of the original.
4

4. Depreciation

  • Depreciation means yearly reduction in value by a fixed percent.
  • Depreciation is calculated on the value at the beginning of each year.
  • For the first year, subtract the depreciation from the present value.

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Full Notes

Key Concepts

Percent means for every hundredA percentage is a fraction whoseTo express a given number asThe formula is x asThe formula is x% of y

Frequently Asked Questions

What are the important topics in Percent and Percentage for ICSE Class 8 Mathematics?
Key topics in Percent and Percentage include Core Meaning and Basic Conversions, Finding Percent, Whole, and Part, Percentage Increase, Decrease, and Change, Depreciation. Study these first, then practise questions on each for Class 8 exams.
How should I revise Percent and Percentage for Class 8 exams?
Learn the core ideas first, then work through the 82 practice questions on Percent and Percentage. 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.

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