Page 2 of 5 · 29 explainers
Knowledge base
More explainers from the knowledge base. Each one names what you need to know first, works through the method, and says where it usually goes wrong.
Concept CalculusWhat Is a Derivative? A Plain ExplanationA derivative measures how fast something is changing at a single instant. Every rule in differentiation is a shortcut for that one idea.
Distinction StatisticsMean, Median and Mode: Which Average to UseThree numbers all called the average, answering three different questions. Choosing wrongly is how statistics ends up misleading.
Method GraphingHow to Find Slope-Intercept Form From Two Pointsy = mx + b is the form that tells you what the line looks like. Two numbers, and each one is visible on the graph.
Method ConvertersHow to Convert Celsius to Fahrenheit (and Back)The formula does two separate things: it changes the size of a degree, then it moves the zero. Missing the second is why manual conversions go wrong.
Concept FractionsWhat Is a Fraction? Numerator and DenominatorA fraction is two numbers doing two different jobs. Once you know which job is which, most of the rules stop needing to be memorised.
Formula FractionsFraction Rules: All Four Operations in One PlaceFour operations, four rules, and one idea underneath all of them: you can only combine parts that are the same size.