Students learn how to set up and solve a pair of simultaneous equations using the elimination method. Learning progresses from solving equations where the coefficients are equal to setting up a pair of equations with different coefficients from known facts.
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.