Surds lesson observation

A very constructed first lesson on surds. I had a lesson observation and needed to teach surds, due to its nature, it can be difficult to think about differentiation, progress, teamwork and at the same time, keeping it constructive. I thought about all of this and the lesson was a success ensuring every student achieved something from my set learning outcomes. I recently taught it again for another lesson observation and it didn't disappoint me.

Starter - Square roots and factors (prior knowledge)
Pair activity - Identifying surds
Main worksheet activity - Fully differentiated
Lesson plan - I have put lots of thought and detail into this lesson.
Assessment - Progress is checked at the start of the lesson and at the end (use mini whiteboards)
ppt - activInspire. All answers to worksheet are included.

This lesson will focus on rewriting surds, simplifying surds and progressing to add/subtract them.