This is one of the best products I have ever seen to help young children learn about numbers and basic arithmetic.
Professor Keith J. Devlin - Stanford Mathematician,
Popular Science Writer, author & NPR "Math Guy"
SumBlox is one of those ideas that seems so simple it is hard to believe nobody's thought of it before. These wooden blocks, shaped like digits with the heights that correspond to number values, create a playful way for young children to explore basic arithmetic.
Jordan Shapiro - Forbes, October 2014