The Hundred Board is a core primary math material supporting children's exploration of the linear counting sequence from 1 to 100 using numbered tiles placed on a gridded board. It builds on work with the Seguin Boards and bridges toward skip-counting, patterns, and early multiplication readiness, typically introduced around age 4.5–6. If your existing board shows wear on the grid lines or you're stocking a second math shelf, this is a reliable replacement that holds up well to daily use.