Studies have shown that teachers may have difficulty not directing students, not determining student progressions and not correcting errors.6,7 For the PBL approach to work, however, teachers need to take on the role of facilitator, encouraging students to work through each problem; this role is “multifaceted and require[s] flexibility” (p. 209).8 When starting units using a PBL model, research suggests that elementary teachers find it difficult to develop an appropriate hook8 – a real-life problem that does not have a single or pre-determined solution and, thus, enables students to develop a variety of answers. In this sense, the value of the problem resides in helping students to develop both an understanding of the mathematics and the ability to apply it.9