Lesson 14 Estimation Exploration

    • Let’s create an Estimation Exploration activity.

Warm-up Estimation Exploration

What is the length of this earthworm?

a photograph of an earthworm with one section labeled as 1 inch

too low

about right

too high

Activity 1 Design Your Estimation Exploration

  1. 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.

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

    Record an estimate that is:

    too low

    about right

    too high

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

Activity 2 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.