Test and organize numbers up to 20. Includes five ways to display the numbers: numerically, 10 frame, dots, Rekenrek and base ten. Cards have color-coded backs to easily choose the style to display the number. Each card measures 2.5" x 3.45" (6.35 cm x 8.8 cm). Includes activity and game suggestions and 5 additional blank cards. Set of 105. Grades PreK+.