Ratio in Year 6 Written problems involving ratio are a popular topic for the KS2 SATs so it is important that children get plenty of opportunities to become familiar with the type of question set. Key points to remember are that ratio compares part to part and like fractions they can be reduced to their simplest terms. e.g. a ratio of 6 to 18 means 6 for every 18 and can be reduced to 1 to 3 or 1 : 3. Try our great Year 6 resources on ratio and proportion. Go to Year 6 Ratio and Proportion