Sumblox Mini (Basic Set) - Set Of 80 Mini Stem Solid Wood Educational Numbers, Including Wooden Box And Pack Of 80 Activity CardsSumblox Are A Groundbreaking Way To Learn Math Through Play. Each Block'S Height Corresponds To The Value, So Adding And Subtracting Is As Simple As Stacking Blocks. This Set Includes 80 Solid Wooden Mini Sumblox Blocks And A Pack Of 80 Activity Cards. Our Original Sumblox Concept Is Now Available In Miniature. The Original Blocks Have Been Used By Educators, Parents And Children To Develop A Wide Range Of Skills For Years. The Sumblox Mini Set Open