Learning Resources Magnetic Addition Machine. Illustrate simple addition in three easy steps with this front of class magnetic addition activity. Young learners put the coloured balls into the corresponding cups, tilt the cups to tip the balls into the funnel before counting the balls as they fall into the answer tray at the bottom. Magnetic maths set includes two cups, an addition funnel, 20 balls and a numbered counting tray. Longest part (tray) measures 28cm L. Includes multilingual activity guide. Suitable for ages 4+.