April DeGennaro, PhD found Numberella:

• Significantly improves attainment“Students learned skills above their grade band because Numberella introduced them through gameplay and this motivated all students at the table to learn a skill.”
• Significantly builds student knowledge“After answering a question, the explanation of the correct answer helps all students advance. Questions all students miss become opportunities for a full-class explanation after the game. ”
• Significantly increases student collaboration“The online houses encourage students to work together during a game to improve house standings. Several questions give points for such collaboration. Students experience camaraderie by seeing their houses ranking improve and cheer for members of their house who are possible "high-scorer" candidates.”
• Moderately reduces attainment gap“I use Numberella at 3rd grade and the reliance on paper/pencil maths stifles students' development of mathematical thinking. Numberella requires them to "work maths out" in their heads thus improving mental models that build maths fluency and conceptual thinking.”
• Significantly improves parental engagement“I had "parent coaches" who played games weekly with students. These parents reported their own maths skills improving, they loved the positive community that formed around Numberella and were pleased with their own children's positive attitudes about mathematics.”