Mini whiteboards are pretty useful at any point in a lesson to check what the kids have learned. In case you haven’t heard of them, they’re small whiteboards that come with a whiteboard pen and an eraser, usually in a plastic folder to keep it all together. You give one to each student and get them all to write answers to questions on them, before holding them up for you (and everyone else) to see.
If you don’t have any, either buy them in or make your own by laminating A4 white card and cutting up cheap cloths to use as erasers. The main issues with mini whiteboards are the hassle of giving them out and getting all the sets back complete, and also the whiteboard pens drying out. But despite the setbacks I find them useful, especially with smaller classes.