# Math Curriculum

## Level DUnit: Ratios and ProportionsKey Lesson 6.2.9 Constant Speed

Lesson topic: Introduction to unit rate concepts

## Instructor Materials

• Teacher guide
• Slides
• Practice Problems resource
• CCRS standard: 6.RP.3b
• Learning goal: Calculate the distance an object travels in 1 unit of time and express it using a phrase like “meters per second” (orally and in writing). For an object moving at a constant speed, use a double number line diagram to represent equivalent ratios between the distance traveled and elapsed time. Justify (orally and in writing) which of two objects is moving faster, by identifying that it travels more distance in the same amount of time or that it travels the same distance in less time.
• 6.2 Assessment and Practice Problems

## Related Lessons

### Review and Extend

Use these supplemental lessons if needed after teaching this key lesson.

Used with permission:

1. IM K-5 Math was originally developed by Open Up Resources (OUR) and authored by Illustrative Mathematics® (IM), and is copyrighted 2017-2019 by Open Up Resources. It is licensed under the Creative Commons Attribution 4.0 International License (CC BY 4.0). OUR's K-5 Math Curriculum is available at https://openupresources.org/math-curriculum/.

3. The Illustrative Mathematics® name and logo are not subject to the Creative Commons license and may not be used without the prior and express written consent of Illustrative Mathematics®.

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