Builds understanding of the many ways to represent numbers from 1 to 20 with these fun dice. Each die shows a number in ten-frame, tally mark, base ten, and numeral format. Includes 4 dice each for 0-5, 5-10, 10-15, and 15-20. Rounded corners for easy rolling. Dice measure 2 x 2 x 2 in. Ages 5+.