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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.
Examples TrigonometryDegrees to Radians Examples: 10 Worked ConversionsTen conversions, and one arc length at the end to show what the exact form is for.
Mistakes Trigonometry5 Common Radian Mistakes and How to Catch ThemOne of these is not an arithmetic slip at all — it is a setting on your calculator, and it produces confident wrong answers all the way through a paper.
Concept ConvertersCelsius and Fahrenheit: Why Two Scales ExistTwo scales, two different starting points and two different degree sizes. Every awkward part of converting between them comes from that.
Examples ConvertersCelsius to Fahrenheit Examples: 10 ConversionsTen conversions, including the two that are not conversions at all — a difference and a kelvin shift.
Mistakes Converters5 Temperature Conversion MistakesEvery one of these is caught by one sanity check: does the answer land where you would expect it to on a weather forecast?
Concept Pre-AlgebraWhat Is a Proportion? Two Equal RatiosA ratio compares two quantities. A proportion claims two ratios are the same — and that claim is what you can solve.