Get a Grip on a Matrix. An Exciting resource that provides plenty of early math practice. Using the challenging activity cards included, children attach pegs of one or two colors to the baseboard, developing logical thinking and problem solving skills. Includes: 1 square grip-board, 6.25" Square. 10 laminated activity cards, graded by difficulty level. 2 coordinate cards without patterns. 36 colorful safety pegs. Instructional guide. Grade: K-4.