It's 2017 and many things have happened since that day when Estimation 180 was just an idea in my head. I've learned a great deal about student thinking around estimation, representing estimates on number lines, displaying student estimates in histograms, and more. As most of you can agree, we've also been extremely fortunate to be given access to building Desmos activities for the past few years. Without further ado, I'm pleased to announce the first series of Estimation 180 challenges housed in Desmos Activity Builder. I've combined a new series of Estimation 180 challenges (Ketchup Containers) with the Desmos Activity Builder. Thanks to Lynda Chung, Dan Luevanos, Kristen Bennett, and Hedge for testing these out in your classes and the valuable feedback you gave me.
- to share with you
- to hear your feedback and classroom experiences
- to build more of these
Notes on the 1st screen:
- use the "Pacing" to restrict students to the first screen
- check your teacher dashboard to:
- ensure every student has submitted a too low, too high, and estimate
- check to see if any students used the sketch tool to share their thinking
Notes on the 2nd screen:
- Use "Pacing" to include screens the 1st & 2nd screens in case students want to revise their range
- Consider having students calculate the range of their too low and too high before moving to the 3rd screen.
Notes on the 3rd screen:
- Use "Pacing" to include the first 3 screens in case students want to revise or revisit the original image
- Look for opportunities to discuss student ranges:
- what make a brave range?
- what estimates are not the midpoint of the too low and too high?
The histogram will calculate the range between the lowest class estimate and the highest class estimate and pretty much divide it into roughly five equivalent ranges. Pretty slick, right?
On this screen, the student is asked, "How does your estimate compare to your classmates' estimates?"
Notes on the 4th screen:
- Consider using "Pacing" to restrict students to this screen.
- Listen to (or look at the dashboard for) student thinking and what they notice about the histogram.
PAUSE student screens immediately or pause it back on the fourth screen. Part of the magic of Estimation 180 is watching the reveal video together! Play the video from your dashboard using the "Student" button in the top right.
Let students celebrate or disagree with the reveal and remind them the journey is what matters most. When the dust has settled, resume the activity and restrict students to the fifth screen so they can watch the video. At the end of the video, students are provided with their percent error and asked to explain their percent error.
Notes on the 5th screen:
- PAUSE student screens immediately or on the screen before (4th screen)
- Play the "reveal" video from your teacher dashboard.
- After the video, allow student to voice/discuss their celebrations or concerns about the reasonableness of the final result.
- Remind students:
- it IS NOT about "the answer"
- it IS about their thinking, their plan, their range, their critique of others, and the process
- consider asking students, "now what do you wonder?"
5th screen BONUS
Resume the activity after watching the video reveal as a class:
- Allow students to watch the video on their device
- At the end of the video, students will be asked to explain their percent error
The Ketchup Containers series starts on Day 221. Enjoy!