Lesson plan

4. Solve time interval problems (A)

  • Created by:
  • Standards:
  • Tags:
teaches Common Core State Standards CCSS.Math.Content.3.MD.A.1 http://corestandards.org/Math/Content/3/MD/A/1
teaches Common Core State Standards CCSS.Math.Practice.MP1 http://corestandards.org/Math/Practice/MP1
teaches Common Core State Standards CCSS.Math.Practice.MP4 http://corestandards.org/Math/Practice/MP4
Quick assign
Preview assignment >
Print

You have saved this lesson plan!

Here's where you can access your saved items.

Dismiss
Content placeholder

Tip: swipe on touch devices, use your keyboard's ← and → arrow keys, or clicker buttons to quickly navigate the lesson plan

or to view additional materials

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

Lesson objective: Solve elapsed time problems where the starting time is unknown by using a number line to represent subtraction.

This lesson provides an opportunity for students to apply their knowledge and understanding of telling time and number operations to solve a real-life situation. Students are asked to determine the range of starting times for making brownies given the elapsed times and the ending time. Students use a number line to understand the problem, the meaning of the question asked, and show their methods for solving the problem.  

Key Concept students will use: 

  • We can use representations such as a number line to solve situational problems involving addition and subtraction of time in minutes.

Skills students will use:

  • a number line to show the time to the nearest minute and
  • a number line to show how to subtract elapsed time.

Students engage in Mathematical Practice 1 (make sense of problems and persevere in solving them) as they use the number lines to show their methods for solving elapsed time problems.

Key vocabulary: 

  • elapsed time 
  • number line
  • range of times

Special materials needed:

  • Judy clock for demonstration
  • Number line for demonstration
  • Student clocks

 

Provide feedback