Lesson Plan

Adding and Subtracting by Splitting

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Eligible Content

Big Ideas

Concepts

Competencies

Objectives

In this unit, students will add and subtract three-digit numbers by splitting. Students will:

  • split each addend into hundreds, tens, and ones. Then they will add the sums of the hundreds, tens, and ones to find the sum of the original two addends.
  • split the minuend into hundreds, tens, and ones. Then they will take away the hundreds, tens, and ones in the subtrahend to find the difference.


Essential Questions

  • How are relationships represented mathematically?
  • What makes a tool and/or strategy appropriate for a given task?


Vocabulary

  • Expanded Form: A way to write numbers that shows the value of each digit (e.g., 4,372 = 4,000 + 300 + 70 + 2).


Duration

45–60 minutes


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