Lesson objective: Understand that clocks are tools that measure time and that the hour hand points directly at the number that represents the hour on the clock face.

Students bring prior knowledge of time from scheduling and calendars. This prior knowledge is extended to include shorter periods of time as students explore the concept of one hour. A conceptual challenge students may encounter is navigating the format of the analog clock.

The concept is developed through work with analog clocks that only have the hour hand, which supports students' understanding of the role of the hour hand and the structure of the clock.

This work helps students deepen their understanding of equivalence because students explore the idea that the hour hand indicates the current hour.

Students engage in Mathematical Practice 7 as they look for and make use of structure on analog clocks starting with the hour hand only.

**Key vocabulary:**

- Analog clock
- Clock face
- Hour
- Hour hand

**Special materials needed:**

- Students can explore multiple representations of time using hands-on manipulatives, such as clocks with the hour hand only, schedules, digital clocks, and calendars.