A number string is a carefully designed sequence of problems for students to solve mentally. It is designed so that students develop a range of strategies for mental computation, explore the connections between strategies, and deepen understanding of such mathematical models as the number line. Number strings also provide opportunities for students to engage in mathematical discourse, both in describing their own strategies and connecting with the mathematical strategies of others. With a number string, the goal is to support students to think flexibly and strategically.
In a typical number string, students gather at the rug, ready to engage in mental mathematics. After each problem is written horizontally on the board, the teacher offers significant wait time to allow students to develop a solution and strategy. A few students share strategies for each problem. Each time a new strategy or idea is shared, the teacher represents the strategy using a particulat mathematical model such as an array, a ratio table, or an open number line.
Each teacher practiced facilitating a number talk with a small group after reading about and discussing the components of a number string.
The Elementary Math Teachers (EMT) Cohort meets monthly for full days to collaborate and learn together.
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