The constructivist learning framework is a foundation for today's K-12 mathematics reform. Many future teachers across the United States are being taught that this is the way students learn best. In this qualitative multi-case study, the teaching methods of 4 university instructors who teach mathematics courses to future elementary teachers were explored. The results of within-case and cross-case analyses demonstrate the constructivist nature of the participants' teaching methods. The results also indicate substantial variation in teaching methods, even though the participants' teaching beliefs are very similar.