**This activity presents a series of spreadsheet puzzles.**Teachers can use the resource to lead pupils through a series of interactive screens in which they need to find missing numbers in a series of Fibonacci-style sequences, known as 'Fibs and truths'.

Objectives covered

- 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
- Solve a pair of simultaneous linear equations by eliminating one variable.

You may find it helpful to look at the short videos (included in the resource file) of a teacher demonstrating the software and its use in a lesson.

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