Three ratio tools: solve a : b = c : x for x, split a total in a given ratio, and simplify a ratio to lowest terms.
Three percentage tools in one: X% of Y, X is what percent of Y, and percent change from one value to another.
Add, subtract, multiply or divide two fractions — the reduced fraction, the mixed number and the decimal.
Convert length (in, ft, yd, mi, mm, cm, m, km), weight (oz, lb, g, kg) and temperature (°F, °C, K) in one place.
Permutations and combinations of n choose k, plus the chance of at least one success in N trials from a single-event probability.
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