Multiples of ten are fairly easy to work out, but nevertheless this is a good game of strategy to play to help reinforce multiples of 10. Choose a number on the grid then try and make it on the calculator by multiplying a number by 10. If correct and the answer on the calculator matches the number on the grid place a coloured counter on the grid. Play then goes to your opponent, with the aim of trying to get 4 in a row.