Average speed is total distance divided by total time — not the average of two speeds. Worked road-trip examples, the mistake almost everyone makes, and how to use it for real travel planning.
Simple interest explained in plain words: the formula, a worked example with real numbers, the difference from compound interest, and the mistakes that cost people money.
Learn how to estimate your electricity bill from units used, with slab rates explained, a step-by-step worked example, and simple ways to lower your bill.
Learn how to calculate exact age from a date of birth in years, months and days, with a step-by-step method, borrowing rules and a fully worked example.
Learn how to work out your BMI with metric and imperial formulas, a worked example, and a simple explanation of what each BMI range means for adults today.
Learn how to calculate a percentage of any number by hand with a clear method, worked examples for discounts, marks and bills, plus quick mental maths tricks.
Learn how to calculate your monthly loan EMI step by step, with a simple formula, a worked example, and tips to see how interest and tenure change your payment.
