Sometimes the best ideas are the most simple! I love a quick mental maths game like this one! Games can be a great way to start, break up or end a lesson. I especially like it when they don't require a whole lot of resources either. Tic Tac Toe - Multiples of ____ To play, either choose a number for the whole class to use or have students roll a die to determine the number. Students take turns writing multiples of that number in a grid. The first person to get 3 in a row wins! Students can use scrap pieces of paper or whiteboards to play.