Proportional Reasoning-2 — Formula Sheet
CBSE · Class 8 · Mathematics
5 formulas from Proportional Reasoning-2 (CBSE Class 8 Mathematics) on one page, grouped by topic. Includes Two ratios a.
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Formulas and Key Relations
1. Proportionality and Cross-Multiplication
a × d = b × c, or a/c = b/d
a : b : c : d :: p : q : r : s → a/p = b/q = c/r = d/s
3. Ratios with More Than Two Terms
x × a/(a + b + c + ...)
x × b/(a + b + c + ...)
Key relations
Two ratios a
b and c : d are proportional if a × d = b × c, or if a/c = b/d.
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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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