Chapter 7 · Class 8 CBSE · Formula Sheet

Direct & Inverse Proportions Formulas — Class 8 CBSE

Identify and solve problems involving direct and inverse proportion.

Key Formulas

Direct Proportion

\dfrac{x_1}{y_1} = \dfrac{x_2}{y_2}

x and y increase/decrease together

Inverse Proportion

x_1 \times y_1 = x_2 \times y_2

One increases as the other decreases

Worked Examples

1Using: Application

Apply the key formula from this topic to a sample problem.

Step 1: Identify the formula.

Step 2: Substitute the values.

Step 3: Simplify to get the answer.

Answer: See solution above

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More Class 8 CBSE Formulas

Squares, Cubes & Their RootsExponents & PowersRational NumbersQuadrilateralsNumber Patterns & PuzzlesAlgebraic Expressions & Identities

Frequently Asked Questions

How many formulas are in Class 8 CBSE Direct & Inverse Proportions?+
There are 2 formulas in the Direct & Inverse Proportions chapter for Class 8 CBSE. Each formula is essential for solving problems in this topic.
How to remember Direct & Inverse Proportions formulas easily?+
Practice regularly with worked examples, group related formulas together, and use SparkEd's interactive practice mode to reinforce your memory through problem-solving.
Are these Direct & Inverse Proportions formulas enough for exams?+
Yes, these formulas cover the complete CBSE Class 8 syllabus for Direct & Inverse Proportions. Practice applying them to different types of questions for full exam readiness.

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