“…4 For the educational context in which these problems were used, see (Bayless, 2002). of the real mathematical needs for the practice of merchants and craftsmen during the Renaissance: money exchange, calculation of interests and annuities, navigation, surveying, gauging, fortification and ballistics (Meskens, 2013). The mathematicians from the Low Countries that contributed most to these practical problems in the sixteenth century were Valentijn Mennher and Michiel Coignet (Mennher, 1556;Coignet, 1597).…”