Arithmetic

Percentages, fractions, ratios and factors.

21 tools in this part of the catalogue.

Work out a percentage of a number, a change or a difference.

Add, subtract, multiply, divide or simplify exact fractions.

Simplify a ratio, or solve one missing value in a proportion.

Find the greatest common divisor and least common multiple.

Work out brackets, powers, roots, trigonometry and logs.

Find exact prime factors of a bounded whole number.

Count arrangements and selections without rounding.

Compare text sets with an explicit case policy.

Round decimals or significant figures with a chosen rule.

Find sequence terms and sums from entered values.

Interpolate between numeric points with a stated linear rule.

Find distance, midpoint, slope and a line through two points.

Calculate exact remainders, modular powers and inverses.

Solve a resistive DC circuit from two known values.

Read resistor bands or encode a representable value.

Calculate complex arithmetic and polar form.

Work with small matrices and inspect singular cases.

Compare vectors and calculate dot, cross and projection.

Calculate volume and total area of six solids.

Solve Ax=b and inspect rank and residuals.

Find approximate real polynomial roots.