What is your favorite mental maths game for kids?

Playing math games in the classroom is a fantastic way to not only stimulate students, but is also an ideal way of improving students’ number facts and number work. As games can be so beneficial I thought it would be fun to share your favorite fun mental maths games for the classroom. Whether you have maths games for year 6 or mental maths games for year 3, I’d love to hear about them all.