This is a whole lesson focusing on calculating magnification in Biology - from a do it now style starter, all the way through to a plenary. The lesson is fully differentiated with model answers. It has assessment built in assessment checkpoints. This lesson not only focuses on knowledge and execution of the calculation, but applies the ideas and gets the students to link it to real life. This lesson is also good for weaker AS level students before they complete harder magnification questions. Objectives: I can describe what is meant by magnification and resolution. I can carry out calculations involving magnification, real size and image size. I can also describe the differences between mm, um, nm. I can work out questions related to magnification by rearranging the formula. I can recognise when/how to change units in questions and how to use standard form. The lesson will: Introduce definitions and basic material. Get students to think and look at conversions of units. Students will then practice calculating magnification and teacher will model how to complete questions. Mini assessment. Quiz Assessment and reinforcement of key ideas Differentiated questions Bronze Silver Gold Model answers Plenary.