Proportional Reasoning-2
CBSE · Class 8 · Mathematics
Step-by-step guide to study Proportional Reasoning-2 in CBSE Class 8 Mathematics. Topics to cover, practice strategy, and time allocation.
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Study Plan
Learn the Theory
Read the textbook chapter carefully. Note down definitions, formulas, and key concepts.
Practice Problems
Solve textbook exercises and additional practice questions. There are 55 questions available for this chapter.
Revise & Test
Revise key formulas and concepts without looking at notes. Take a practice quiz to test your understanding. Mark weak areas for re-revision.
Spaced Revision
Revisit Proportional Reasoning-2 after a week. Use flashcards for quick recall. Solve previous year questions from this chapter.
What to Focus On
- Proportional ratios have the same value.
- Use a × d = b × c to test two ratios.
- Idli batter ratios 6 : 3 and 4 : 2 are proportional.
- Ratios can have more than two terms.
- If one term is scaled, all terms must be scaled by the same factor.
- Puneet’s spice mix ratio is 4 : 2 : 1 : 0.5.
- Add all parts before dividing a whole.
- 12 divided in the ratio 2 : 1 gives 8 and 4.
- Triangle angles always sum to 180°.
Common Mistakes to Avoid
Any pair of ratios with the same numbers in different order is proportional.
A Representative Fraction gives road distance on a map.
In a multi-term ratio, only the first two terms need to be scaled.
Memory Tips
Cross-multiplication test for proportional ratios
Representative Fraction on maps
More than two terms in a ratio
Multi-term proportional equality
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Sources & Official References
- NCERT Official — ncert.nic.in
- CBSE Academic — cbseacademic.nic.in
- CBSE Official — cbse.gov.in
- National Education Policy 2020 — education.gov.in
Content is aligned to the official syllabus. Refer to the board website for the latest curriculum.
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Practice Quiz
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Important Questions
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Revision Notes
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Formula Sheet
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Chapter Summary
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Concept Maps
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Flashcards
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Syllabus
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NCERT Solutions
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Quizzes, flashcards, AI doubt-solver and a step-by-step study plan for CBSE Class 8 Mathematics.