Join Unifix Cubes (sold separately) with these Corner Cubes to form right angles. Students can build rectangles allowing them to explore area, perimeter and more. 

Simply attach standard size Unifix cubes to the corner cubes and build rectangles, explore area, perimeter and more. But don't stop at rectangles. With 40 corner cubes, children are free to build and create all the while learning basic geometry!

Includes 40 corner cubes and an activity guide.