Each die is ten-sided so students can generate numbers by recognizing patterns depicting zero to nine.Use to demonstrate perceptual subitizing. Using these dice, children quickly recognize the cardinality of small groups without counting.Use to progress into conceptual subitizing in teaching math skills, where quantities of larger groups are determined by quickly subitizing and combining smaller groups (i.e. 3 groups of five items for the number 15, or 2 groups of 10 for the number 20).Use to support more advanced methods for addition, subtraction, multiplication, and division.Made of acrylic.