How do you differentiate instruction for mixed-ability learners?
I differentiate in content, process and product, and I plan it before the lesson, not on the fly.
First I know where students are, through a short diagnostic, prior work or exit tickets. Then I design one clear learning objective for the class and multiple routes to it. I might give some students a scaffolded version with sentence starters and worked examples, a core task for most, and an extension that asks for analysis or a new application.
I use flexible grouping so students are not labelled, and I vary the support: guided practice with me for those who need it, independent work for those who are ready, and peer explanation for others.
Assessment is the check. I use mini whiteboards, targeted questioning or a quick task to see who has understood, and I adjust the next lesson based on that evidence rather than assuming.