This material introduces children to the written symbols of the decimal system — 1 through 9, 10 through 90, 100 through 900, and 1000 — organized on trays that mirror the layout used in the quantity materials (C205), allowing for direct pairing in association and exchange activities. Designed for ages 5–7, it supports the critical conceptual bridge between concrete quantity and abstract numeral, a step that often requires repeated, unhurried presentation. Having the symbols housed in dedicated trays rather than loose cards keeps presentations clean and helps children internalize hierarchical place value through physical arrangement alone.