Hi olipage, I posted something on this a while back but cannot find it - sorry! In essence, get the children outside and standing along a number line (use laminated A4 cards folded in half to mark out every 10 metres, or chalk to mark out every unit - it depends on whether you are on grass, in gym, playground etc. Get them to stand anywhere they like, then ask them to run to, for example: The nearest multiple of 10; 10 more than their current number; One less than their current number; Half their current number (differentiation). Hope some of this is suitable. Good Luck.