Choose a child to be ‘on’. They then go and stand behind another child’s chair. The teacher calls out a times table question, e.g. 2 x 5.
The child who is ‘on’ and the child in the chair have to shout out the answer to the question as quickly as they can. Whoever wins can move on to another child. The losing child sits down/stays seated. You can keep a tally of how many chairs a particular child can get around without having to sit down.
A very good game to get quick recall of multiplication facts. Of course, it can be done with any other type of calculation.