Teach in 20 Upper and lower bounds

This started as a teaching prompt to prepare my year 10 set 2 for a end of year mock and it was based on topics we hadn't studied yet.

I found I could teach them the content and go through an example and then get them try a question in about 20 minutes - that is 3 new topics in a 60 minute lesson.

I printed the PowerPoints as handouts and got the students to work on them.

You can of course use them as you see fit.

Feedback would be much appreciated!

Enjoy :)