Subtraction race - plenary game

I've only done this with a sensible Year 5 class, so I'd use it at your discretion. At the end of our topic of mental subtraction, my children were all quite fast at working out the sums. I set up my class so there was plenty of space between the tables and my desk. I cut up the cards, and had a set for each table. I handed out the top card to each group, they had to work out the 3 answers, race to bring it to me, I'd mark it and give the next one, and so on. Yes it is a bit manic, if you have support staff, use them, but trust me they absolutely love it!!!!!!