Here is a very constructive differentiated student resource that contains visual representations for how we divide fractions. Suitable for KS3 and KS4
Starter - Prior knowledge for multiplying fractions and converting mixed fractions to top heavy
Assessment opportunities to measure the progress at the start of the lesson to the end.
ActivInspire slides demonstrating the visual representations, explanations and answers (fractional parts can be visually moved to show one fitting into another)
Paired activity - they get the chance to work on questions that contain dividing fractions with pictures. It offers a great opportunity for coming up with their own rule, they come so close working in pairs but sharing with the class, they figure it out which is what you and your observer wants, not you telling them the rule.
Differentiated worksheet task - Suitable for all learners. Contains mixed fractions division and written questions higher ability as well as basic questions for weaker students.
The Plenary is used to measure the progress from the start of the lesson - mini white board. This activity is also done at the start to show your observer what the students have learnt from the lesson.
A descriptive lesson plan explaining everything you need to do.
I have used this several times and hasn't disappointed me.