Using numbers in place of dots, these dice are engraved with digits in colors of the rainbow. Come up with all sorts of games to practice your math facts, or let the kids do it! You could also use them for review - assign a number to a list of questions or spelling words, roll a dice and answer that question or spell that word. Replace your ordinary dice in a family favorite game with these to freshen things up! Imagine rolling a 12-sided die instead of a 6-sider while playing Monopoly! You will get a D6, D8, D10, D12, D20 and then a triangular one w/3 numbers on each side, and a 10 sider with 00,10, 20, 30, etc to 90. They come in a handy little plastic box for storage too.