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Providing a child-appropriate interface to an arithmetic package with arbitrarily large numbers and exact fractions is surprisingly challenging. We discuss solutions to problems ranging from how to present fractions such as 1/3 to how to deal with numbers with tens of thousands of digits to how to deal with irrational numbers. As with other objects in ToonTalk ® , we strive to make the enhanced numbers work in a concrete and playful manner.doi:10.1145/1017833.1017860 dblp:conf/acmidc/Kahn04 fatcat:sgocaukrivasfk2zimmw5dxmam