A mathematical task has been defined as a set of problems ...
Adding it up (2001) describes mathematical proficiency in terms of five intertwined strands:
1. Conceptual understanding
2. Procedural fluency
3. Strategic competence
4. Adaptive reasoning
5. Productive disposition
Given the multi-faceted nature of mathematical proficiency, students should work on a wide variety of mathematical tasks if they are to develop all five of these strands.
A mathematical task is a problem or set of problems that focuses students’ attention on a particular mathematical idea and/or provides an opportunity to develop or use a particular mathematical habit of mind.
The term mathematical idea includes both mathematical concepts and procedures—these are addressed by the CCSSM standards for mathematical content. Mathematical habits of mind are addressed by the CCSSM standards for mathematical practice. Teaching tasks are designed to support students’ mathematical learning or development and assessment tasks are designed to evaluate the development of students’ mathematical knowledge and/or habits of mind. We can think of these categories as defining the use of a task, although a single task might be useful in more than one way. For example, a task that requires using a familiar mathematical idea in a novel context (including a mathematical context) can be used as a practice task to help solidify students' understanding of that particular mathematical idea, or it can be used to assess how securely the student understands the idea. We will call the mathematical idea and/or habit of mind that a task is intending to develop or assess, along with its intended use, the purpose of the task.
The most basic characteristics of a good mathematical task are that:
a. It has a well-defined purpose, and
b. It has a reasonable chance of fulfilling its purpose if used appropriately.
Note that defining the purpose of a task (a) is a theoretical activity and determining its potential efficacy (b) is predominantly an empirical process. In addition, good mathematical tasks:
• Are carefully worded.
• Are free of mathematical errors.
• Use mathematical vocabulary and symbols accurately and appropriately.
• Only include diagrams, pictures, or illustrations that support comprehension of or provide mathematical meaning for the problem.
• Render standard mathematical representations according to convention and with care and attentiveness to detail.
• Employ contexts in a thoughtful manner.
• Pay careful attention to units in contextual problems.
• Provide appropriate expectations for the precision of a numeric answer.
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