## Reflection: Connection to Prior Knowledge Using Open Number Lines to Determine Elapsed Time - Section 5: Guided Practice: Elapsed Time 30 Minute Intervals

Building on what students know from second grade is not only a good review, it's an important step in reinforcing their conceptual understanding and building their confidence in a realistic way.  In this lesson I slowly step up the rigor to really cement their basic understanding.

I cannot emphasize enough how important it is to make sure that the fundamentals are in place before stepping them up to one minute intervals.  Even students who may have mastered it last year might have forgotten it over the summer.  Looking at digital clocks doesn't engage students in the same kind of analysis of time as the analog clock, which more completely represents the fractional parts of an hour.

Building a Conceptual Understanding
Connection to Prior Knowledge: Building a Conceptual Understanding

# Using Open Number Lines to Determine Elapsed Time

Unit 6: Time
Lesson 5 of 11

## Big Idea: Open number lines are a versatile and simple mental model for measuring elapsed time. This lesson develops students' analog knowledge using the skills they are close to mastering.

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Standards:
Subject(s):
Math, Number Sense and Operations, telling time, elapsed time, time
63 minutes

### Jennifer Valentine

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