Students learn how to use two-way tables, sample space and Venn Diagrams to calculate the probability of two or more events happening. As learning progresses they use set notation to describe whether events are mutually exclusive.
My experience as a Head of Mathematics going through the deep dive OFSTED inspection.
How to use ratios and proportional reasoning as a model for finding the original amount after a percentage change.
To find the area of compound shapes students need to understand what the word compound means.