# teachers promoting student mathematical reasoning

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Teachers Promoting StudentMathematical Reasoning

Mary MuellerSeton Hall University

muellemf@shu.edu

investigations in MatheMatics LearningThe Research Council on Mathematics Learning

Winter Edition 2014, Volume 7, Number 2

Dina YankelewitzMercy College

Carolyn MaherRutgers University

Introduction

The importance of students building arguments to support their solutions to problems and then defending these arguments is undisputed (Alibert & Thomas, 1991; Balacheff, 1991; Ball & Bass, 2003; Francisco & Maher, 2005; Maher, 1995, 2005; Yackel & Hanna, 2003). However, there is a need for more knowledge about the types of classroom communities that promote reasoning and justifications and the teachers role in the community. In this paper we analyze and discuss specific teacher moves that led to the formation of a community of learners in which students co-constructed arguments, provided justifications for solutions, and engaged in mathematical reasoning. Research has shown that certain conditions promote meaningful, mathematical learning. These include a combination of the following: (a) challenged and active students; (b) observant teachers who attend to the developing ideas of students; (c) appropriate, open-ended tasks that invite students to extend their learning as they build and justify solutions; (d) student collaborations that make possible the exchange of ideas; and (e) a setting that respects and welcomes student ideas, conjectures, and alternative ways of working. Under these conditions even young children develop confidence in their ability to solve problems and offer justifications for solutions that take the form of proof (Cobb, 2000; Lampert & Cobb, 2003; Maher & Martino, 1996; Martino & Maher, 1999; Maher 2005, 2009; Yackel & Hanna, 2003). A crucial feature of such communities is the teachers ability to react responsively, in particular when it comes to facilitating the building of arguments. Prior research on the value of teacher interventions with elementary school

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age children has shown the importance of timely questioning in encouraging students to support their solutions (Maher, 2009; Martino & Maher, 1999). This study extends the research on teacher questioning by examining specific teacher moves that encouraged students to collaborate, freely share ideas, question each others ideas and solutions, and build arguments for the solu-tions posed. Krussel, Edwards, and Springer (2004) define a discourse move as a deliberate action taken by a teacher to participate in or influence the discourse in the mathematics classroom (p. 309). For the purposes of this paper, we use the term teacher moves to refer to purposeful, verbal interven-tions made by the teacher after the posing of a task. These deliberate, verbal moves are intended to influence student discussion and reasoning about mathematics by encouraging students to verbalize their ideas, to make these ideas public, and to justify their solutions to their peers.

Theoretical Framework

Guiding our perspective is the notion that in order to build a community that promotes mathematical reasoning, particular conditions need to be in place. In this section we discuss these four interrelated themes: (a) thought-ful teacher interventions; (b) the posing of strategic questions; and (c) the development of a community that supports reasoning and the co-construction of ideas; and (d) the establishment of socio-mathematical norms.

Teacher Interventions Teacher interventions are a critical component of creating an environment that promotes the sharing of ideas in a learning community. Thoughtful interventions, implemented according to students developing ideas, allow students to take ownership of their learning and solutions. According to Maher and Martino (1996), by minimizing the teachers role during initial exploration, students are more likely to engage in mathematical discourse, share representations, co-construct ideas and justifications, and ultimately take a more active role in their own learning. In this way, teachers can facilitate more elegant, clear explanations which lead to detailed, efficient representations and ultimately to further refined arguments by students (Maher, 2009). However, teacher questioning is crucial in drawing out elaborate forms of reasoning and deeper understanding. While our working definition of teacher moves specifically focuses on verbal moves, peripheral interventions such as task design/initiation of tasks and listening play a critical role in establishing a mathematical community and promoting student autonomy.

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Tasks Task selection or design is an intervention that often is planned before a teacher enters the classroom. Many researchers have emphasized the impor-tance of task features in promoting reasoning and understanding (Doerr & English, 2006; Francisco & Maher, 2005; Henningsen & Stein, 1997; Maher, 2002; Maher & Martino, 1996; Stein, Grover, & Henningsen). Challenging, open-ended tasks are open to multiple representations and multiple strate-gies for solutions (Maher, 2002; Francisco & Maher, 2005). At the same time, mathematical discourse can be promoted as students work together on tasks. Strands of related problems may be later revisited over time (Francisco & Maher, 2005). In addition, tasks that are novel to the students, in that a procedure is not readily available, encourage students to rely on their own mathematical resources. After posing tasks, the teacher encourages students to begin to build their justifications and share ideas. During this phase the teacher engages in observation and careful listening in order to estimate how children are thinking about their solutions. Based on the type of task posed, the teacher initiates specific moves to promote reasoning and understanding. In this paper we will discuss the connection between the kind of task that is posed and teacher moves.

Listening As they attempt to promote understanding, teachers must practice being skilled and attentive listeners. By listening, teachers are able to recognize if students are constructing their solution from an understanding of the condi-tions of the problems (as compared with behavior that might suggest that they are parroting the behaviors of others with little understanding), make decisions based on having a meaningful understanding of the ideas and how they are related, and recognize student conceptions that seem plausible as well as student actions that suggest obstacles toward successful problem solving (Martino & Maher, 1999).

Questioning Teacher questioning plays a crucial role in promoting student understanding, construction of new knowledge, as well as the sharing of ideas (Moyer & Milewicz, 2002). Martino and Maher (1999) stress the importance of teacher questioning in creating an environment that promotes mathematical understanding and problem solving. Sahin and Kum (2008) suggest that teachers should be cognizant of the types of questions they are asking and their purpose of asking these questions. Skillful questioning of student thinking and monitoring of student problem solving can provide teachers with a deeper understanding of the development of students mathematical ideas and help advance student mathematical growth. Sahin and Kulm (2008) developed a

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model for looking at teacher questioning. They considered three main types of questions: probing, guiding, and factual. Probing questions consisted of those that ask students to explain their thinking, offer justifications or proof, and use prior knowledge in attending to the task at hand. These questions, according to Sahin and Kulm (2008), served the role of extending students conceptual understanding and encouraging them to relate new ideas to prior notions and schemas. Guiding questions were identified as those that sought to guide students problem solving by asking for solutions, strategies or procedures, and thus scaffolding student understanding of a concept. Guiding questions tended to support students in creating their own heuristics and deriving mathematical concepts. Finally, factual questions were requests for facts or definitions, as well as answers or next steps in a problem. Sahin and Kulm (2008) concluded that the majority of teacher questions are factual, even when using reform-based curricula that includes probing and guiding questions in the teaching guides. They suggest that by asking probing and guiding questions, teachers invite students to share their ideas and justifications with others, and thus create a classroom community that supports the building of ideas and conjectures. Towers (1998, 2002) studied the process of classroom interactions that leads to the growth of mathematical understanding and identified teacher intervention themes which include the following: showing and telling, leading, shepherding, checking, reinforcing, inviting, clue-giving, managing, enculturing, blocking, modeling, praising, rug-pulling, retreating, and anticipating. According to Towers, teachers traditionally use two types of teaching, each involving multiple interventions: showing and telling and leading. In the first, teachers usually give information without checking understanding; while with the latter, the teachers ask frequent questions but at a low level. Towers (1998) offers an alternative approach which she calls shepherding. This approach involves directing the students through subtle nudging, coaxing and prompting (p. 30).

Establishing a Mathematical Community Teacher moves are crucial in the establishment of mathematical learning communities. Mathematical reasoning and understanding naturally results from the communication that takes place in such communiti