Learning Resources Wipe Clean Hundred Boards (Set of 10). These versatile hundred boards will be a staple resource in your primary numeracy classroom year after year! Wipe-clean, double-sided boards feature numbers 1 – 100 on one side and a blank grid on the reverse. Ideal for a variety of maths activities including counting, number recognition and graphing. Use with dry-erase markers for repeated use. Boards measure 30cm square. Set of 10. Suitable for ages 5+.