This is a student answer sheet for any of 20 IWB activites where students are challenged with 20 mental math questions in quick succession. Each of my pupils have a copy of the sheet that they use under an overlay and each simply records their score in their jotter.
Each activity has 20 question followed by the answers. There is also a sheet that teachers may choose to use to issue to pupils for recording answers. This is easily adapted and pupils derive a huge level of enjoyment from the challenge of this type of activity.
The slides are timed so all the teacher needs to do is press F5 and the activty runs itself.