Lesson where you are given four inputs and two operations (multiply and add or subtract) to create an output. You are then asked to find the corresponding two operations for a given set of input-outputs. Two options usually possible but one may not be onbvious because to involves fractions. Two approaches are offered.

- Interactive ActivInspire file with embedded teacher notes is available
- Interactive Powerpoint downloadable
- Teacher Notes included

Four gifs below are included in the ActivInspire and PowerPoint files.