Four operations algorithm is among the major topics occupying a significant position in primary school schedule. Moreover, utilizing alternative strategies during the education process and improving operation flexibility of students also considered important in teaching of mathematics. Flexibility in computing is the ability of solving any operation also by using various cognitive or model based calculation strategies with different methods. Giving place for these strategies in education process for improvement of skills of using different strategies and guiding students enabling them to develop their own strategies is important. In this study, in addition to the teaching the standard algorithm, covering a massive place in our courses, it is aimed to review the classroom teachers' opinions for the alternative strategies of four operation that means their flexibility in the procedural process (procedural flexibility). The procedural flexibility is discussed through strategies and standard algorithms using preliminary learning such as modeling, mental processing and place value concept. It is a qualitative study conducted in 2018-2019 academic year with 45 classroom teachers. In the study, a 2-question open-ended question form based on multiplication and consisting of two different scenarios was used as data collection tool. The most favorite strategy preferred by teachers according to the findings obtained from this form is standard algorithm followed by mental process strategy. However, teachers showed no flexibility in the process, they did not prefer other alternative strategies given about multiplication and they reported negative opinions about some of them.