Design a lesson plan on math problem solving at the elementary level (Grade 1, 2, 3 or 4).

Include the following:

1. Overview: Write an introduction to the class activity. Include the purpose of the activity and desired outcome.

2. Objectives: The objectives should be specific and measurable.

3. Time: How long will the activity take when implemented in the classroom?

4. Materials: Describe any materials that are needed to conduct the lesson.

5. Activity: Provide a detailed description of the activity. Write all steps from the instruction of the assessment.