Your device is currently offline. You can view downloaded files in My Downloads.

Lesson Plan

5. Use number lines to find differences between lengths (FP)

teaches Common Core State Standards CCSS.Math.Content.2.MD.B.5
teaches Common Core State Standards CCSS.Math.Practice.MP6
teaches Common Core State Standards CCSS.Math.Practice.MP7
Quick Assign

You have saved this lesson!

Here's where you can access your saved items.


Card of

or to view additional materials

You'll gain access to interventions, extensions, task implementation guides, and more for this lesson.

Lesson objective: Find the difference between lengths using a number line.

This lesson helps to build procedural skill with whole number subtraction. A number line diagram is used here because it highlights part-whole relationships and supports the strategy of "counting on" to find a missing addend or "counting back" to subtract. This work develops students' understanding that we can use a number line to solve many types of addition and subtraction problems related to length.

Students engage in Mathematical Practice 6 (Attend to precision) as they label number line diagrams precisely. They also engage in Mathematical Practice 7 (Look for and make use of structure) as they look for number patterns and relationships on the number lines to develop computational strategies.

Key vocabulary:

  • addend
  • count back
  • count on
  • difference
  • number line diagram

Special materials needed:

  • blank number lines (optional)
Related content

Appears in

Relating addition and subtraction strategies to length

Provide feedback