Math and statistics
Averages, ratios, fractions and the statistics ideas behind them, with worked examples you can check by hand.
- Guide · September 19, 2026How to Add, Subtract, Multiply and Divide FractionsThe four fraction operations, each with one clear rule and one worked example, plus how to simplify and convert mixed numbers.
- Guide · September 19, 2026How to Calculate the Average (Mean, Median and Mode)Three different averages, one worked example, and a simple rule for deciding which one describes your data honestly.
- Guide · September 19, 2026How to Simplify a Ratio and Solve ProportionsDivide both sides by their greatest common divisor to simplify, and cross-multiply to solve for a missing value.
- Article · September 19, 2026Mean, Median or Mode: Which Average Should You Use?When someone says 'the average', they usually mean the mean. But a single extreme value can make it a poor description of the typical case.