Tree Blocks are “unit blocks” cut precisely to heights of 2, 4, 6, 8 and 10cm. They can be combined with other building toys. As children handle, compare and build with these blocks, they develop better understand of math concepts, setting them up for success in school. The Tree Blocks “Math Kit” includes a standing ruler, dice and an activity deck in 3 skill levels. It conforms to NCTM standards for cognitive and skills development.