The Decimal Symbol with Cards activity introduces children to the symbols of the decimal system—unit, ten, hundred, and thousand—and their corresponding numerals using a set of large color-coded cards and wooden or printed decimal symbols. By matching numerals (1, 10, 100, 1000) with decimal symbol representations, children build a deeper understanding of place value, hierarchical relationships, and the structure of the base-ten system. This work is typically done alongside Golden Beads and the Bank Game.