# Lesson Plan: Adding and Subtracting Units of Time Mathematics • 5th Grade

This lesson plan includes the objectives, prerequisites, and exclusions of the lesson teaching students how to measure time in hours, minutes, and seconds and solve elapsed time problems.

#### Objectives

Students will be able to

- add and subtract units of time to find duration, start time, and end time,
- add and subtract mixed units of time,
- convert units of time to add and subtract,
- solve word problems by adding and subtracting units of time.

#### Prerequisites

Students should already be familiar with

- expressing durations of time using mixed units of time,
- converting units of time.

#### Exclusions

Students will not cover

- 24-hour time.