Tools

Add, subtract, multiply and divide fractions with steps.

Break a number into prime factors with steps and a prime check.

Find the GCD and LCM of several numbers with steps.

Percent of, what percent, and increase/decrease — with exact steps.

List all divisors with count, sum, pairs, and the count formula.

Convert length, weight, area, volume, and time units exactly, with steps.

Solve for x with step-by-step transposition.

Reduce ratios to simplest form and solve proportions for x, with steps.

Enter two of speed, time, and distance to find the third, with steps.

Find the mean of several numbers with steps, assumed-mean method, and reverse mode.

Pick a shape, enter the sides or radius, and get area or volume with steps.