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Unit 8 - Lesson 14 - Grade 3: Illustrative Mathematics

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Grade 3 Unit
Lesson 14: Estimation Exploration
CC BY 2021 Illustrative Mathematics®
Grade 3 Unit
Lesson 14: Estimation Exploration
CC BY 2021 Illustrative Mathematics®
Lesson: Estimation Exploration

Estimation Exploration: Fractional Measurement (Warm Up)

What is the length of this earthworm?
Record an estimate that is:

Design Your Estimation Exploration

Find an object or an image that would make an interesting estimation problem. Write a question that would encourage others to answer with a length estimated to the nearest half or fourth of an inch.

Think about possible estimates others might make for the length of the object or image.

Record an estimate that is:

Measure the length of the object or image to make sure your estimates make sense. If needed, revise your estimates.

Facilitate Your Estimation Exploration

  1. Display your image for your classmates.
  2. Ask them, “What is an estimate that’s too high? Too low? About right?”
  3. Give them a minute of quiet think time.
  4. Give them a minute to discuss together.
  5. Ask them to share their estimates.
  6. Record their ideas.

Record your classmates' estimates.

Cool Down: Estimation Exploration Reflection

Describe a time when you were able to explain your ideas to other people in your class.