The NumberSense Companion Connecting Cubes set consists of 100 interconnecting cubes in 10 different colours. The cubes support the development of spatial sense and reasoning. They are also used to develop an understanding of measurement concepts. The different colours allow the cubes to be used in probability experiments. The NumberSense Connecting Cubes are used in the activities described in the Companion Teacher Guide and Companion Activity Cards and can be purchased as a set or as part of the NumberSense Companion Activity Kit – classroom set.