The use of difference and differential equations in the modelling is a topic usually studied by advanced students in mathematics. However difference and differential equations appear in the school curriculum in many direct or hidden ways. Difference equations first enter in the curriculum when studying arithmetic sequences. Moreover Newtonian mechanics provides many examples for differential equations and numeric solution leads to difference equations which can be treated easily with Computer Algebra or Dynamic Geometry Systems. My hypothesis is that numerical methods supported by technology serve a tool that helps the early introduction of modelling concept. (Contains 6 figures.)