I use these in 5th grade. They could easily be used in 4th-6th grade. Of course, flash cards can be used in MANY different ways. Solo, with a partner, game-form (think the card game "War" -- which would be super fun with this set!), or countless others. ⚫I love to use these as kids either enter or exit the classroom! They enjoy the challenge, they love to race their friends, and it's a nice way to greet each student while simultaneously getting them to think hard about math.⚫Sometimes I will gi