5 minus 2 is shown through children queueing for the toilet. If two children go into the toilet how many are still queueing? 5 minus 4 is shown through children jumping into a swimming pool. If 4 jump in how many are left? 5 minus 5 is shown through all 5 children being in the pool and 5 of them leaving, how many will be left in the pool?
Pupils could be given five different objects in the classroom and take it in turns to take away different amounts. Show the children five objects, cover them up and take away a certain number, ask the children how many have been taken away, and repeat with different numbers.