This is an introduction to function notation, suitable for younger KS3 pupils. It consists of the following: 1. Matching Function Machine to Notation to Value, is a cut-out and match-up worksheet, where students match each function machine to the correct function notation, then to the correct evaluation of f(10) 2. Writing Function Machines with Function Notation, is a powerpoint of questions, with answers, for students to work through as a consolidation exercise. 3. Evaluating Function is a basic write-on worksheet for students who will need examples and a more supported approach in their independent working, so ideal as a homework sheet for lower ability classes.