Reading a ratio
A ratio compares two amounts using the same unit. The order matters: 2 : 3 is not the same as 3 : 2. Simplifying a ratio keeps that relationship while using the smallest whole numbers, which makes it easier to read and compare against other ratios.
Ratios, parts and percentages
Adding the parts of a ratio gives the total number of parts. Each side's share of that total can be written as a fraction or a percentage, which is useful for splitting a bill, mixing a recipe or dividing profits in proportion to each contribution.