Number Bond Board WITH NUMBER TILES 26Size: Board 20*21. 5*1. 8 cm Weight: 700 GM Material: Rubber Wood. Colour: Natural Minimum Age: 3 Yrs+ A Number Bond Tray helps children visually see how numbers join together, and how they break down into component parts. Used for primary students as a jumping off point for adding and subtracting. You can use written numbers or quantities of objects to work on addition and subtraction. This tray works with all of our flat Number tiles. OPTIONS: "Tray