Substituting into Algebraic Expressions

7A–2: Understand that relationships can be generalised using algebraic statements, and substitute values into expressions, formulae, and equations to evaluate them.
Develops fluency in interpreting symbols as representations of relationships rather than merely instructions, working between verbal, symbolic, and graphical forms. Encourages accurate use of conventions, avoidance of common errors such as conflating addition and multiplication (e.g., writing 7 + m as 7m), and deepens understanding of equality and structure through varied examples and contexts.