This is another good online game that will help you to practise factors and multiples. You have a 100 square and start by choosing a number less than 50. The idea is to try to make your opponent unable to go because they can’t find a factor or a multiple. What strategies are likely to win?
You could also try to play on your own and perhaps see how long a chain of factors and multiples you could make. What would be the numbers to avoid in this game?