Key Mathematical Ideas:

Computational strategies for multidigit addition and subtraction rely on the place-value system and properties of the operations.

Examining the reasoning that underlies addition and subtraction procedures, including the standard algorithms, provides a context for students to deepen their understanding of the place-value system and of the operations themselves.

Elaborations

The videos below elaborate on the key ideas from this session. This is a great opportunity to consolidate your learning before moving onto the next session.

Preparation for Session 4:

Read Chapter 4: Multiplication of Multidigit Numbers from your casebook. Consider the questions posed in the introduction of the chapter.

Note: The cases span grade levels 3 to 9 so you may encounter ideas that are not typically covered in the grade(s) you teach. Consider looking for connections to the math concepts your students engage with.  

Session Checkpoint

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