Rule of three

Direct/inverse three-rule, proportionality tables.

Course

Complete course + quiz to master the rule of three.

Available1

Direct, inverse, tables + quizzes for quick learning.

Simple rule of three, table, missing value.

Available3

Calculate a missing value in direct proportion.

Solve a rule of three using a proportion table.

Quickly find the unknown value (direct).

Inverse rule of three and inverse proportion situations.

Available1

Solve an inverse proportionality problem.

Complete / verify a proportionality table.

Available2

Complete the missing values of a table.

Test if the rows/columns are proportional.