Description: Lesson 1 is an exploration in which students use stopwatches to measure time as a physical quantity. They might, for example, time how long it takes to write the fact 7 × 8 = 56 forty times or measure how long it takes to write numbers from 0 to 100. Lesson 2 builds students' understanding of time as a continuous unit of measurement. Lesson 3 increases students' level of precision as they read and write time to the nearest minute. In preparation for Lessons 4 and 5, students add minutes by counting on the number line and clock. For example, they might use the count by fives and some ones strategy to locate 17 minutes and then keep counting to find 4 minutes more.

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