The purpose of this study was to examine children's mathematical understandings related to participation in tithing (giving 10% of earnings to the church). Observations of church services and events, as well as interviews with parents, children, and church leaders, were analyzed in an effort to capture the ways in which mathematical problem solving was related to the social context of tithing. I introduce the direct influence model to describe components of the practice itself and to identify supports and constraints that exist related to children's opportunities to engage in problem solving that varied by participation frequency and mathematical complexity. (Contains 2 figures and 1 footnote.)