Here's my all time favorite problem-based lesson that helps students conceptually learn about surface area. Check out Andrew Stadel's lesson at estimation180.com/filecabinet/
August 15, 2026 at 7:07 PM
Here's my all time favorite problem-based lesson that helps students conceptually learn about surface area. Check out Andrew Stadel's lesson at estimation180.com/filecabinet/
I love this lesson from Andrew Stadel that uses cup stacks to build conceptual understanding of systems of equations. I know of no better lesson for teaching systems of equations.
estimation180.com/stackingc...
estimation180.com/stackingc...
May 2, 2026 at 7:07 PM
I love this lesson from Andrew Stadel that uses cup stacks to build conceptual understanding of systems of equations. I know of no better lesson for teaching systems of equations.
estimation180.com/stackingc...
estimation180.com/stackingc...
If you wish your students had better number sense, then you'll love the estimation tasks from Andrew Stadel on Estimation 180. Here are the first twenty to get you started.
estimation180.com/days-1-20/
estimation180.com/days-1-20/
February 7, 2026 at 8:07 PM
If you wish your students had better number sense, then you'll love the estimation tasks from Andrew Stadel on Estimation 180. Here are the first twenty to get you started.
estimation180.com/days-1-20/
estimation180.com/days-1-20/
Looking for fun 3-act tasks for elementary and middle school students? Check out these lessons from Andrew Stadel at estimation180.com/lessons/
November 22, 2025 at 8:07 PM
Looking for fun 3-act tasks for elementary and middle school students? Check out these lessons from Andrew Stadel at estimation180.com/lessons/
Visiting my family this week, where it is fish fly season (biblical-plague levels of fish flies covering ever surface). Quite the deal on Airbnbs this time of year, though. 🥴
Zoom in on the picture and #estimation180 those critters, #iteachmath community. #notice #wonder
Zoom in on the picture and #estimation180 those critters, #iteachmath community. #notice #wonder
June 18, 2026 at 12:39 PM
Visiting my family this week, where it is fish fly season (biblical-plague levels of fish flies covering ever surface). Quite the deal on Airbnbs this time of year, though. 🥴
Zoom in on the picture and #estimation180 those critters, #iteachmath community. #notice #wonder
Zoom in on the picture and #estimation180 those critters, #iteachmath community. #notice #wonder
MLB Statcast showed metrics on the HR Derby broadcast down to the 10th decimal place of a foot.
For reference, 0.0000000001 ft. = 30 picometers. A hydrogen atom is 60 picometers. MLB claims they can track a spinning baseball in flight to within half a hydrogen atom.
For reference, 0.0000000001 ft. = 30 picometers. A hydrogen atom is 60 picometers. MLB claims they can track a spinning baseball in flight to within half a hydrogen atom.
July 16, 2025 at 4:35 PM
January 6, 2025 at 9:12 PM
8. Estimation180 - Resource Review
https://eduhacking.com/estimation-180/
#Estimation #MathHacks #MathLessons
https://eduhacking.com/estimation-180/
#Estimation #MathHacks #MathLessons
May 5, 2025 at 7:05 AM
8. Estimation180 - Resource Review
https://eduhacking.com/estimation-180/
#Estimation #MathHacks #MathLessons
https://eduhacking.com/estimation-180/
#Estimation #MathHacks #MathLessons
Started class today with a quick Estimation180 prompt. How many pennies in the bowl? Average class estimate was 393 (min 226, max 800). Way more under-estimates than over-estimates. #ITeachMath estimation180.com/day-151/
February 21, 2025 at 8:35 PM
Started class today with a quick Estimation180 prompt. How many pennies in the bowl? Average class estimate was 393 (min 226, max 800). Way more under-estimates than over-estimates. #ITeachMath estimation180.com/day-151/
Saw this story on my news feed today… “woman ran barefoot over 100 meters of Lego”. So many math questions! The first of which is what do you think a 100m by 0.5m patch of Lego cost! #Estimation180 #ITeachMath www.cbc.ca/radio/asitha...
January 23, 2025 at 8:07 PM
Saw this story on my news feed today… “woman ran barefoot over 100 meters of Lego”. So many math questions! The first of which is what do you think a 100m by 0.5m patch of Lego cost! #Estimation180 #ITeachMath www.cbc.ca/radio/asitha...
Estimation180 is down as is all of Andrew Stadel's other stuff. I'm not on that other social media site - does anyone know what's going on with him? Hope he is ok.
June 9, 2025 at 2:25 PM
Estimation180 is down as is all of Andrew Stadel's other stuff. I'm not on that other social media site - does anyone know what's going on with him? Hope he is ok.
Having some estimation fun on the walls outside the library thanks to the hard work of @mr_stadel and hisresources. #librarybulletinboards #teacherlibrarians #teacherlibrarianlife
estimation180.com
estimation180.com
December 6, 2024 at 7:51 PM
Having some estimation fun on the walls outside the library thanks to the hard work of @mr_stadel and hisresources. #librarybulletinboards #teacherlibrarians #teacherlibrarianlife
estimation180.com
estimation180.com
Some honest conversations around the topic of estimating yesterday. The general feel was that students didn’t see the value. They were sure hooked bythough! Thanks @mr_stadel #sd33learns #mathchat #bclearns
estimation180.com
estimation180.com
December 6, 2024 at 7:26 PM
Some honest conversations around the topic of estimating yesterday. The general feel was that students didn’t see the value. They were sure hooked bythough! Thanks @mr_stadel #sd33learns #mathchat #bclearns
estimation180.com
estimation180.com
Grade 3 #Estimation180 Toolkit is getting some massive additions this summer.
One of those is FRACTIONS!!!
+++ fun games.
I dig it and think Students and Teachers will too!!!
One of those is FRACTIONS!!!
+++ fun games.
I dig it and think Students and Teachers will too!!!
June 30, 2026 at 12:05 AM
Grade 3 #Estimation180 Toolkit is getting some massive additions this summer.
One of those is FRACTIONS!!!
+++ fun games.
I dig it and think Students and Teachers will too!!!
One of those is FRACTIONS!!!
+++ fun games.
I dig it and think Students and Teachers will too!!!
Make Integers Visual
New video blog post on how I reimagine integers in an #estimation180 fashion to help students develop number sense.
#mtbos #iteachmath
Check it out here: www.andrewstadel.com/blog/visual-...
New video blog post on how I reimagine integers in an #estimation180 fashion to help students develop number sense.
#mtbos #iteachmath
Check it out here: www.andrewstadel.com/blog/visual-...
Make Integers Visual
Reimagine teaching integers in a visual manner and less abstract. Grade 6 integers can be fun and visual through Estimation 180 tasks and fluency games.
www.andrewstadel.com
October 15, 2025 at 1:48 PM
Make Integers Visual
New video blog post on how I reimagine integers in an #estimation180 fashion to help students develop number sense.
#mtbos #iteachmath
Check it out here: www.andrewstadel.com/blog/visual-...
New video blog post on how I reimagine integers in an #estimation180 fashion to help students develop number sense.
#mtbos #iteachmath
Check it out here: www.andrewstadel.com/blog/visual-...
Estimation 180 Toolkit Grade 6 Installment #3 is LIVE!
Make sense of INTEGERS through conceptual lessons and a fluency game that fit perfectly into your core curriculum.
#mtbos #iteachmath
Learn more at estimation180.com/toolkit-grad...
Make sense of INTEGERS through conceptual lessons and a fluency game that fit perfectly into your core curriculum.
#mtbos #iteachmath
Learn more at estimation180.com/toolkit-grad...
October 10, 2025 at 2:18 PM
Estimation 180 Toolkit Grade 6 Installment #3 is LIVE!
Make sense of INTEGERS through conceptual lessons and a fluency game that fit perfectly into your core curriculum.
#mtbos #iteachmath
Learn more at estimation180.com/toolkit-grad...
Make sense of INTEGERS through conceptual lessons and a fluency game that fit perfectly into your core curriculum.
#mtbos #iteachmath
Learn more at estimation180.com/toolkit-grad...
Teachers! The newest Grade 6 Estimation 180 Toolkit is coming this Friday 🎉
It’s packed with lessons and a fluency game that help students see and understand integers.
Learn more at estimation180.com/toolkit-grad...
#mtbos #iteachmath
It’s packed with lessons and a fluency game that help students see and understand integers.
Learn more at estimation180.com/toolkit-grad...
#mtbos #iteachmath
October 8, 2025 at 2:20 PM
Teachers! The newest Grade 6 Estimation 180 Toolkit is coming this Friday 🎉
It’s packed with lessons and a fluency game that help students see and understand integers.
Learn more at estimation180.com/toolkit-grad...
#mtbos #iteachmath
It’s packed with lessons and a fluency game that help students see and understand integers.
Learn more at estimation180.com/toolkit-grad...
#mtbos #iteachmath
About how many cheesy crackers does it take to learn multiplication in Grade 3? 😀
Next installment of the #Estimation180 Grade 3 Toolkit coming this week. #mtbos #iteachmath You can learn more at estimation180.com/toolkit
Next installment of the #Estimation180 Grade 3 Toolkit coming this week. #mtbos #iteachmath You can learn more at estimation180.com/toolkit
September 27, 2025 at 9:29 PM
About how many cheesy crackers does it take to learn multiplication in Grade 3? 😀
Next installment of the #Estimation180 Grade 3 Toolkit coming this week. #mtbos #iteachmath You can learn more at estimation180.com/toolkit
Next installment of the #Estimation180 Grade 3 Toolkit coming this week. #mtbos #iteachmath You can learn more at estimation180.com/toolkit
NEW blog post:
Estimation 180 SUCKS at Ratios.
Plus: Why I Love Achieve the Core and Illustrative Mathematics
www.andrewstadel.com/blog/bring-l...
Check it out. #mtbos #iteachmath #estimation180 @illustratemath.bsky.social
Estimation 180 SUCKS at Ratios.
Plus: Why I Love Achieve the Core and Illustrative Mathematics
www.andrewstadel.com/blog/bring-l...
Check it out. #mtbos #iteachmath #estimation180 @illustratemath.bsky.social
Bring Life to Ratios
In this blog post, Andrew Stadel shares a few downsides to Estimation 180, positive of Achieve the Core and Illustrative mathematics and how the Estimation 180 Toolkit can bring life to ratios for Gra...
www.andrewstadel.com
September 24, 2025 at 4:58 AM
NEW blog post:
Estimation 180 SUCKS at Ratios.
Plus: Why I Love Achieve the Core and Illustrative Mathematics
www.andrewstadel.com/blog/bring-l...
Check it out. #mtbos #iteachmath #estimation180 @illustratemath.bsky.social
Estimation 180 SUCKS at Ratios.
Plus: Why I Love Achieve the Core and Illustrative Mathematics
www.andrewstadel.com/blog/bring-l...
Check it out. #mtbos #iteachmath #estimation180 @illustratemath.bsky.social
Grade 3. It’s about to get cheesy in the Estimation 180 Toolkit with:
• multiplication
• division
• addition
• subtraction
#estimation180 #mtbos #iteachmath
• multiplication
• division
• addition
• subtraction
#estimation180 #mtbos #iteachmath
September 20, 2025 at 10:51 PM
Grade 3. It’s about to get cheesy in the Estimation 180 Toolkit with:
• multiplication
• division
• addition
• subtraction
#estimation180 #mtbos #iteachmath
• multiplication
• division
• addition
• subtraction
#estimation180 #mtbos #iteachmath
NEW Installment to the
Grade 6 Estimation 180 Toolkit
this Friday.
Packed with RATIOS goodies.
See what's inside here:
estimation180.com/toolkit-grad...
#mtbos #iteachmath #estimation180
Grade 6 Estimation 180 Toolkit
this Friday.
Packed with RATIOS goodies.
See what's inside here:
estimation180.com/toolkit-grad...
#mtbos #iteachmath #estimation180
September 15, 2025 at 11:16 PM
NEW Installment to the
Grade 6 Estimation 180 Toolkit
this Friday.
Packed with RATIOS goodies.
See what's inside here:
estimation180.com/toolkit-grad...
#mtbos #iteachmath #estimation180
Grade 6 Estimation 180 Toolkit
this Friday.
Packed with RATIOS goodies.
See what's inside here:
estimation180.com/toolkit-grad...
#mtbos #iteachmath #estimation180
About how many red/yellow counters are in each cup?
#estimation180 #mtbos #iteachmath
If I were to dump them out...how many red? how many yellow?
#estimation180 #mtbos #iteachmath
If I were to dump them out...how many red? how many yellow?
September 11, 2025 at 2:45 AM
About how many red/yellow counters are in each cup?
#estimation180 #mtbos #iteachmath
If I were to dump them out...how many red? how many yellow?
#estimation180 #mtbos #iteachmath
If I were to dump them out...how many red? how many yellow?
Got a delivery today for the Estimation 180 Toolkit. Pumped to put this task together for Math 6.
You can learn more about the toolkits at estimation180.com/toolkit
You can learn more about the toolkits at estimation180.com/toolkit
August 25, 2025 at 4:09 AM
Got a delivery today for the Estimation 180 Toolkit. Pumped to put this task together for Math 6.
You can learn more about the toolkits at estimation180.com/toolkit
You can learn more about the toolkits at estimation180.com/toolkit
4 MAJOR Updates: my Summer 2025 Recap
New blog post: www.andrewstadel.com/blog/summer2...
I'm thrilled about what's in the works... Estimation 180 Toolkits. #iteachmath #mtbos #estimation180
New blog post: www.andrewstadel.com/blog/summer2...
I'm thrilled about what's in the works... Estimation 180 Toolkits. #iteachmath #mtbos #estimation180
2025 Summer Recap • 4 Major Updates
In this blog post, Andrew Stadel recaps everything he accomplished during the summer of 2025 and a few things to look forward to at Estimation 180 and andrewstadel.com.
www.andrewstadel.com
August 20, 2025 at 11:17 PM
4 MAJOR Updates: my Summer 2025 Recap
New blog post: www.andrewstadel.com/blog/summer2...
I'm thrilled about what's in the works... Estimation 180 Toolkits. #iteachmath #mtbos #estimation180
New blog post: www.andrewstadel.com/blog/summer2...
I'm thrilled about what's in the works... Estimation 180 Toolkits. #iteachmath #mtbos #estimation180