What is a ratio?

A ratio compares quantities. Written 'a : b', it says how many of one thing there are for a given number of another. A ratio of 2 : 3 means two of the first for every three of the second. Ratios can be simplified like fractions.

Examples

• 2 : 3 (2 blue for every 3 red).
• The ratio 4 : 2 simplifies to 2 : 1.
• Mixing squash 1 : 4 with water.

Quick facts

• Simplify a ratio by dividing both parts by the same number.
• A ratio of 1 : 1 means equal amounts of each.