Hi all. I've been invited to teach a lesson next week as part of a job interview. They've asked me to teach Year 5 Maths, with a focus on mental Maths. There will be four small groups who will rotate so I will be teaching for 15 mins each, and they are differentiated by group. Does anyone have any ideas for me, I'm completely lacking inspiration, as you can probably tell I have not taught upper KS2 Maths for a long time! Thank you in advance for your help!