Hand2Mind Numberblocks 21 - 30 Activity SetWow! Kids, lets see how numbers really work! Were going to build our very own awesome Numberblocks characters from 21 to 30 how exciting is that? Through discovery and play, children can supercharge their math skills, practicing counting, adding, subtracting, and so much more! This set comes with a whopping 255 MathLink Cubes to build Numberblocks 2130, plus 20 fun math activities and plenty of extra play pieces. Amazing! NUMBERBLOCKS is a trademark