The CCSS for Mathematics include both content standards and standards for mathematical practice. The content standards define "what students should understand and be able to do." The standards for mathematical practice describe "varieties of expertise that mathematics educators...should seek to develop in their students."
Some practice standards may have been familiar to mathematics educators in the past as "best practices." Others may be new. Some educators think of the content standards as the "what" and the practice standards as the "how." According to the CCSS, "The Standards for Mathematical Practice describe varieties of expertise that mathematics educators at all levels should seek to develop in their students." How can we do this?
Some educators argue that we should just give students as many tasks as possible that draw on or require them to use as many mathematical practices as possible when determining the solution path for a task that targets a mathematical concept. Some educators argue that by continually giving students high-level tasks to work on, they will eventually engage with all the math practices. We argue that we must design strategically for engagement of students with all the mathematics practices regularly.
Consider Mathematical Practice Standard #7, "Look for and make use of structure." This practice may be new to educators. Don't overlook its potential value for both student learning and for formative assessment. Unless we give students opportunities to work on tasks that target the standards for mathematical content and require students to explain their reasoning with diagrams, equations, or written explanations of the structure of the mathematics of the task, we might find ourselves with a limited or false sense of student understanding.
Let's think this through using a third grade task:
This simple task asks students to work with several content standards:
This simple task asks students to use a variety of mathematical practices:
Students engage in four practice standards, pretty good! Now consider what more occurs when a final prompt is added to the task:
Students are asked to use an additional mathematical practice:
MP#7 (Look for and make use of structure) comes into play. Without the final prompt, we may fail to find out if students really understand the reason why both expressions equal 12 candies. The focus on 2 bags versus 4 bags draws students' attention to the number of equal groups in relationship to the number of items in each of the groups. Ideally, students will explain that the two students’ amounts are equivalent because although Jerome has more bags he has fewer candies in each whereas Samantha has fewer bags but each bag has more candies so, in the end, the total number of candies are the same.
So, yes, tasks must address a content standard and as many of the mathematical practices as possible. But at some point during a unit of study it is crucial for students to look for and make use of a structure, to engage with the mathematical practice that requires them to reason about the underlying mathematical concepts which are articulated in many of the content standards. Remember to keep your eye on and design for engagement with Mathematical Practice #7, look for and make use of structure.