Ratios and direct proportion
Write ratios in their simplest form, fill in the missing term of an equivalent ratio, compute unit rates, and solve direct-proportion problems.
Available exercises
Ratio in simplest form
Write a given ratio of two numbers in its simplest form — divide both terms by their common factor.
Equivalent ratio — fill in the missing term
Given a ratio a:b, fill in the missing term of the equivalent ratio a·k : b·k.
Unit rate
Find the price for one item, given the total cost for several items.
Recipe — how much of each ingredient?
Word problem: a recipe is for N people. How many grams of an ingredient do you need for K people?
Word problems with ratios
Splitting a whole in a ratio, equivalent ratios and scaling recipes.