6 years & up. Build math-fact fluency like never before with this exciting tri-FACTa™ Addition and Subtraction Game for Grades 1 and Beyond! The familiar triangle format provides a visual cue, as children find the right numbers to complete the fact families. This game promotes early math skills, problem-solving, and critical thinking. This game set includes a triangle game board, 100 cards with facts up to 20, and 4 trays. Great for 2 - 4 players.