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2012f.01019 Eggermont, Hilde Hautekiet, Gerd Van den Broeck, Luc Mathematics and knitting. (Wiskunde en breien.) Uitwiskeling 28, No. 1, 12-44 (2012). 2012 Uitwiskeling - redactie, Nieuwrode NL M90 F60 knitting exponential functions Diophantine equations geometric series Euclidean division Knitting and crochet are back! Various initiatives shoot up like mushrooms from the ground: knitting caf\'es, wild knitting actions, exhibitions\dots In this article, a limited introduction to knitting and crochet techniques is provided. The pupils learn to understand and calculate a knitting pattern in order, for example, to pack in a tennis ball. During the modeling of the various little projects, some mathematics emerge: the Euclidean division, exponential functions, Diophantine equations\dots Michel Roelens (Leuven)