This grid offers a way for students to deepen their understanding of substitution, by going beyond numerical substitution and allowing for students to substitute expressions into an expression.
I believe that this is an important, but often overlooked skill; it feeds into many areas of higher Maths, for example, solving simultaneous equations via substation.
This task requires a lot of prerequisite knowledge, pupils must be familiar with basic substitution, multiplying algebraic terms, collecting like terms, expanding single and double brackets, index laws, and simple algebraic fractions, to name just a few.
