About this Clip
Percentage is one of the most fundamental concepts in Quantitative Aptitude, serving as the building block for topics like Profit and Loss, Simple and Compound Interest, Data Interpretation (DI), and Mixture and Alligation. By definition, a percentage is a fraction or ratio expressed as a fraction of 100 (denoted by the symbol "%").
This video clip covers the core mathematical formulas, calculation shortcuts, and exam-oriented problem-solving strategies:
- Fraction to Percentage Conversions: Memorizing standard fraction-to-percentage values (e.g., 1/2 = 50%, 1/3 = 33.33%, 1/6 = 16.67%, 1/8 = 12.5%, 1/11 = 9.09%) to drastically speed up calculations during exams.
- Percentage Increase and Decrease: Understanding how to calculate changes using the formula:
Percentage Change = (Difference / Original Value) × 100 - Successive Percentage Changes: Using the shortcut formula
(a + b + ab/100)%to solve problems involving consecutive increases or decreases (like compound depreciation or consecutive discounts). - Product Constancy Rule: Solving problems where the product of two variables remains constant (e.g.,
Price × Consumption = Expenditure). If the price of a commodity increases, the percentage reduction in consumption required to keep expenditure constant can be solved instantly.
Whether you are preparing for CSAT, banking exams, SSC, or placement tests, mastering percentage calculations is key to solving complex quantitative problems efficiently. This clip provides a clear, concept-first walkthrough with solved examples and speed math techniques.