Attract students to the fun of learning addition with this magnetic whiteboard teaching tool. Just place the Addition Machine on any magnetic surface, then use the cups, funnels, and numbered tray to visually demonstrate addition. It’s a simple and unique way to enhance your math lessons! Tray measures 11 L. Educational Benefits Learning Style:Visual, Tactile Skill Development: Counting, Addition, Fine motor skills, Eye-hand coordination Includes 2 Cups, Funnel, 20 Balls (10 green, 10 blue), Number line, Equals sign, Numbered tray.