David and Rob invented the successful Math/STEM manipulative called Intooba. This is an exciting and innovative manipulative building process, a valuable learning tool throughout the elementary school years - from Kindergarten through to sixth grade in MATH and STEM/STEAM. As children become used to working with the sets, the questions become progressively more complicated as the grades progress. Additionally, the materials can be used across curriculum subjects in many areas of instruction. For more information click here.