I used these cards for revision of Pythag and Trig recently.
They are really nice and there are lots of them so you can decide how far you want to go. I just have the file and I’m not sure who created them, so if you know, let me know so I can credit them / link directly.
This sort of activity works really well with a class that will have productive and supportive conversations about the maths and enjoy challenging each other. It gets them out of their seats and they start to get a sense of which questions are straightforward and which will present more of a challenge. I’m on the look out for similar things for other topics.
I’ll be setting this for homework as it has explanations as well as examples all in one place:
mho maths 