This lesson focuses on helping students calculate elapsed time using both analog clocks and number lines. The learning objective is for students to understand how to model duration and solve time interval problems effectively. They will practice tracking time intervals, such as moving from 2:15 to 2:45 on a clock, and illustrating the same duration on a number line. Students will then engage in hands-on activities, calculating elapsed time from various scenarios such as a morning routine and recess time. The lesson concludes with a reflection on the tools used in finding the answers.