I bought this for my 2nd grader, but my 6th grader and I both ended up playing it too-- it is fun. The game is well designed so that the numbers used for calculations get larger as the game progresses, so the player is motivated to keep trying even if the numbers start to look a little daunting to them. The way that base 10 is visualized is well aligned with how my 2nd grader is being taught math in school.