DIDACTUS Math Cards Magic for children Mathematical cool card trick that children love! Amazing and spectacular, yet easy to implement! Educational game, the child performs magic by using a non-complicated mathematical calculation and surprises the participants! High quality 17 laminated cards (Cards size: 9cm X 6cm) Three mathematical levels: Easy (4 Yellow cards), Medium (6 Green cards), Advanced (6 Blue cards) Suitable for age 5 and above, also for teenagers and even adults!