This article makes known some mathematical practices, in the sense of Alberti (2007), evidenced in some of the work activities performed by workers in the marketplace Corabastos (Bogota, Colombia). Such practices were identified by following the guidelines of ethnographic research, which identified that the applicability of mathematics in everyday contexts, is not confined to the manipulation of numbers from arithmetic operations, but includes mathematical activities how to design , counting, measure, locate and explain (Bishop 1999). To this end, refers to two types of economic activities corresponding to the distribution of pumpkins and sale of maize-cobs, which identifies mathematical situations presented to them as workers, from mathematical practices, they face these situations.