**This activity presents a series of spreadsheets that lead pupils through a series of interactive screens.**Pupils need to create expressions to solve increasingly complex algebra squares.

The puzzles are:

- Substitution equation squares
- Simple equation squares
- Complex equation squares

- Use letter symbols to represent unknown numbers or variables; know the meanings of the words 'term', 'expression' and 'equation'
- Simplify linear algebraic expressions by collecting like terms; multiply a single term over a bracket (integer coefficients)
- Construct and solve simple linear equations with integer coefficients (unknown on one side only) using an appropriate method (e.g. inverse operations)
- Use simple formulae from mathematics and other subjects; substitute positive integers into linear expressions and formulae and, in simple cases, derive a formula.

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