India celebrates National Mathematics Day on December 22 to commemorate the birth anniversary of the Indian mathematician Srinivasa Ramanujan. He shaped
twentieth-century mathematics with his contributions in mathematical analysis, infinite series, continued fractions, number theory, and game theory. His work continues to influence modern mathematics more than a century later. He is one of the greatest Indian mathematicians who died at the mere age of 32. Since 2012, India has celebrated National Mathematics Day on December 22. 1. Percentage Formula Percentage = (Part ÷ Whole) × 100 Example: If you score 450 marks out of 500, your percentage is (450 ÷ 500) × 100 = 90%. It is also used to calculate discounts, like 20% off on a Rs 1000 product, which means you save Rs 200. 2. Simple Interest Formula SI = (P × R × T) ÷ 100 Example: If you deposit Rs 10000 at 5% interest for 2 years, SI = (10000 × 5 × 2) ÷ 100 = Rs 1000. This formula helps in understanding bank interest and small loans. 3. Distance–Speed–Time Formula Distance = Speed × Time Example: If a car travels at 60 km/h for 2 hours, the distance covered is 60 × 2 = 120 km. This is useful for planning journeys and estimating travel time. 4. Average Formula Average = Sum of Values ÷ Number of Values Example: If you spend Rs 200, Rs 300, and Rs 500 over three days, the average daily spending is (200 + 300 + 500) ÷ 3 = Rs 333.33. This helps in budgeting and tracking expenses. 5. Profit and Loss Formula Profit = Selling Price − Cost Price Loss = Cost Price − Selling Price Example: If you buy a book for Rs 300 and sell it for Rs 400, the profit is Rs 100. This formula is useful for business decisions and resale planning.
