Had a great time facilitating a workshop about getting the English class vertical. We explored vocabulary, composition, reading fluency, all in an integrated way. #btcc24 @btcthinks #btcthinks

aledaklassen's tweet image. Had a great time facilitating a workshop about getting the English class vertical. We explored vocabulary, composition, reading fluency, all in an integrated way. 

#btcc24 
@btcthinks
#btcthinks
aledaklassen's tweet image. Had a great time facilitating a workshop about getting the English class vertical. We explored vocabulary, composition, reading fluency, all in an integrated way. 

#btcc24 
@btcthinks
#btcthinks
aledaklassen's tweet image. Had a great time facilitating a workshop about getting the English class vertical. We explored vocabulary, composition, reading fluency, all in an integrated way. 

#btcc24 
@btcthinks
#btcthinks

#mineolaproud of the engagement and conversations these Ss put in taking the test “again” with a random partner before getting their tests back. #BTCthinks

staci_durnin's tweet image. #mineolaproud of the engagement and conversations these Ss put in taking the test “again” with a random partner before getting their tests back. #BTCthinks
staci_durnin's tweet image. #mineolaproud of the engagement and conversations these Ss put in taking the test “again” with a random partner before getting their tests back. #BTCthinks

Twelve Days of Christmas thinking task. Finding out how many total gifts after 12 days and noticing many number patterns while doing so. #BTCthinks #makingmathfun

staci_durnin's tweet image. Twelve Days of Christmas thinking task. Finding out how many total gifts after 12 days and noticing many number patterns while doing so. 
#BTCthinks #makingmathfun
staci_durnin's tweet image. Twelve Days of Christmas thinking task. Finding out how many total gifts after 12 days and noticing many number patterns while doing so. 
#BTCthinks #makingmathfun
staci_durnin's tweet image. Twelve Days of Christmas thinking task. Finding out how many total gifts after 12 days and noticing many number patterns while doing so. 
#BTCthinks #makingmathfun

It’s been awhile. BTC in action! #mineolaproud to see the engagement and hear the discussions amongst the groups. #BTCthinks #mathtalk

staci_durnin's tweet image. It’s been awhile. BTC in action! #mineolaproud to see the engagement  and hear the discussions amongst the groups. #BTCthinks #mathtalk
staci_durnin's tweet image. It’s been awhile. BTC in action! #mineolaproud to see the engagement  and hear the discussions amongst the groups. #BTCthinks #mathtalk

So #Mineolaproud of this learner! Using resources to understand a skill. #neuronsticker #BTCthinks

staci_durnin's tweet image. So #Mineolaproud of this learner! Using resources to understand a skill. #neuronsticker #BTCthinks

.@JudytaLarsen and I had lots of fun planning for & facilitating a workshop at #btcc24 that went beyond math. Cross-contamination & double dipping gave lots to debate and think about...from gross factors to social acceptability to designing experiments. #btcthinks @BTCthinks

aledaklassen's tweet image. .@JudytaLarsen and I had lots of fun planning for & facilitating a workshop at #btcc24 that went beyond math. Cross-contamination & double dipping gave lots to debate and think about...from gross factors to social acceptability to designing experiments. 

#btcthinks
@BTCthinks
aledaklassen's tweet image. .@JudytaLarsen and I had lots of fun planning for & facilitating a workshop at #btcc24 that went beyond math. Cross-contamination & double dipping gave lots to debate and think about...from gross factors to social acceptability to designing experiments. 

#btcthinks
@BTCthinks
aledaklassen's tweet image. .@JudytaLarsen and I had lots of fun planning for & facilitating a workshop at #btcc24 that went beyond math. Cross-contamination & double dipping gave lots to debate and think about...from gross factors to social acceptability to designing experiments. 

#btcthinks
@BTCthinks

POV: You start reading (and highlighting) ONLY most important pieces from @pgliljedahl @webbkyle and @MaeganGiroux Math Tasks books!! #btcthinks #btclife #buildingthinkingclassrooms #educationmasterpiece #mathtasks


Today marks the 5th anniversary of the official release of the first BTC book. So much has happened in that time. Thank you to all the teachers who have been with me on this journey. Take a look at the virtual launch. #BTCthinks youtube.com/watch?v=ZTS9i5…

pgliljedahl's tweet card. Building Thinking Classrooms Book Launch Party

youtube.com

YouTube

Building Thinking Classrooms Book Launch Party


The sweet sound of BTC in action. #mineolaproud #BTCthinks


It was great to get up at the boards and thinking to start our new unit. #BTCthinks #mineolaproud

staci_durnin's tweet image. It was great to get up at the boards and thinking to start our new unit. #BTCthinks #mineolaproud
staci_durnin's tweet image. It was great to get up at the boards and thinking to start our new unit. #BTCthinks #mineolaproud
staci_durnin's tweet image. It was great to get up at the boards and thinking to start our new unit. #BTCthinks #mineolaproud
staci_durnin's tweet image. It was great to get up at the boards and thinking to start our new unit. #BTCthinks #mineolaproud

First week of school and you’re so engrossed in task that you stay inside during bell break. #BTCthinks #mineolaproud

staci_durnin's tweet image. First week of school and you’re so engrossed in task that you stay inside during bell break. #BTCthinks #mineolaproud
staci_durnin's tweet image. First week of school and you’re so engrossed in task that you stay inside during bell break. #BTCthinks #mineolaproud
staci_durnin's tweet image. First week of school and you’re so engrossed in task that you stay inside during bell break. #BTCthinks #mineolaproud

Love seeing BTC with @desmosclassroom Tiles lesson. What a perfect combination of valuing thinking and the process of learning. We had a lively debate on whether the lesson creator goofed in the scale factor should actually be 9. #BTCthinks

traciteacher's tweet image. Love seeing BTC with @desmosclassroom Tiles lesson. What a perfect combination of valuing thinking and the process of learning. We had a lively debate on whether the lesson creator goofed in the scale factor should actually be 9. #BTCthinks
traciteacher's tweet image. Love seeing BTC with @desmosclassroom Tiles lesson. What a perfect combination of valuing thinking and the process of learning. We had a lively debate on whether the lesson creator goofed in the scale factor should actually be 9. #BTCthinks
traciteacher's tweet image. Love seeing BTC with @desmosclassroom Tiles lesson. What a perfect combination of valuing thinking and the process of learning. We had a lively debate on whether the lesson creator goofed in the scale factor should actually be 9. #BTCthinks
traciteacher's tweet image. Love seeing BTC with @desmosclassroom Tiles lesson. What a perfect combination of valuing thinking and the process of learning. We had a lively debate on whether the lesson creator goofed in the scale factor should actually be 9. #BTCthinks

Using CAS to simplify radical expressions so we can explore & make sense of patterns we see. Lots of good discussions and insights today. Link to the thin slice activity can be found in the video description here: youtu.be/Gj-a_QkRsTI. @pgliljedahl @BTCthinks #BTCThinks #MTBoS


At least my Amazon boxes are being put to good use! Discovering Surface Area and Nets without realizing they’re discovering Surface Area and Nets. #BTCthinks #BuildingThinkingClassrooms

staci_durnin's tweet image. At least my Amazon boxes are being put to good use! Discovering Surface Area and Nets without realizing they’re discovering Surface Area and Nets. #BTCthinks #BuildingThinkingClassrooms
staci_durnin's tweet image. At least my Amazon boxes are being put to good use! Discovering Surface Area and Nets without realizing they’re discovering Surface Area and Nets. #BTCthinks #BuildingThinkingClassrooms
staci_durnin's tweet image. At least my Amazon boxes are being put to good use! Discovering Surface Area and Nets without realizing they’re discovering Surface Area and Nets. #BTCthinks #BuildingThinkingClassrooms

#BTCthinks in Science! Discovering Newton’s Laws of Motion #mineolaproud of the Ss collaboration with each other.

staci_durnin's tweet image. #BTCthinks in Science! Discovering Newton’s Laws of Motion #mineolaproud of the Ss collaboration with each other.
staci_durnin's tweet image. #BTCthinks in Science! Discovering Newton’s Laws of Motion #mineolaproud of the Ss collaboration with each other.
staci_durnin's tweet image. #BTCthinks in Science! Discovering Newton’s Laws of Motion #mineolaproud of the Ss collaboration with each other.
staci_durnin's tweet image. #BTCthinks in Science! Discovering Newton’s Laws of Motion #mineolaproud of the Ss collaboration with each other.

What’s better than getting up and thinking on a Monday! Great way to start our week! #Mineolaproud #BTCthinks

staci_durnin's tweet image. What’s better than getting up and thinking on a Monday! Great way to start our week! #Mineolaproud #BTCthinks
staci_durnin's tweet image. What’s better than getting up and thinking on a Monday! Great way to start our week! #Mineolaproud #BTCthinks
staci_durnin's tweet image. What’s better than getting up and thinking on a Monday! Great way to start our week! #Mineolaproud #BTCthinks
staci_durnin's tweet image. What’s better than getting up and thinking on a Monday! Great way to start our week! #Mineolaproud #BTCthinks

Great couple of days working in Waterloo/Kitchener. @wipebook makes #BTCthinks workshops possible anywhere, including this massive former gymnasium. @WCDSBInnovates

pgliljedahl's tweet image. Great couple of days working in Waterloo/Kitchener. @wipebook makes #BTCthinks workshops possible anywhere, including this massive former gymnasium. @WCDSBInnovates

POV: You start reading (and highlighting) ONLY most important pieces from @pgliljedahl @webbkyle and @MaeganGiroux Math Tasks books!! #btcthinks #btclife #buildingthinkingclassrooms #educationmasterpiece #mathtasks


Today marks the 5th anniversary of the official release of the first BTC book. So much has happened in that time. Thank you to all the teachers who have been with me on this journey. Take a look at the virtual launch. #BTCthinks youtube.com/watch?v=ZTS9i5…

pgliljedahl's tweet card. Building Thinking Classrooms Book Launch Party

youtube.com

YouTube

Building Thinking Classrooms Book Launch Party


Welcome to v 5.0 of the BTC auto-grading rubric: OLD BUGS ARE GONE & lots of slick new features have been added! Shout out & T/Y to @mccainm's for her creative genius re: making this possible. More: youtu.be/_KPXVp7fp-k. @pgliljedahl @BTCthinks #MTBoS #ITeachMath #btcthinks

TimBrzezinski's tweet image. Welcome to v 5.0 of the BTC auto-grading rubric: OLD BUGS ARE GONE & lots of slick new features have been added!  Shout out & T/Y to @mccainm's for her creative genius re: making this possible. More: youtu.be/_KPXVp7fp-k. @pgliljedahl @BTCthinks #MTBoS #ITeachMath #btcthinks

🧠 Hey #BTCThinks builders! If @pgliljedahl reprogrammed your brain (same 🙋‍♀️) and your walls scream VNPS, I made something for you: The Thinking Desk. Built with BTC in mind. 👇 #BuildingThinkingClassrooms #thethinkingdesk #howstudentslearn #innovation #womanownedsmallbusiness


Great conference in Seattle for #BTC2025 #BTCthinks @BTCthinks always great to talk to and learn from @KSquared_Math @webbkyle I hear Saskatchewan is beautiful this time of year. 😁 C U in Connecticut? @pgliljedahl I’ll let you know how my year in Grade 4 went. Nouns and verbs!


It’s been awhile. BTC in action! #mineolaproud to see the engagement and hear the discussions amongst the groups. #BTCthinks #mathtalk

staci_durnin's tweet image. It’s been awhile. BTC in action! #mineolaproud to see the engagement  and hear the discussions amongst the groups. #BTCthinks #mathtalk
staci_durnin's tweet image. It’s been awhile. BTC in action! #mineolaproud to see the engagement  and hear the discussions amongst the groups. #BTCthinks #mathtalk

This was an encouraging email to receive this weekend! #btcthinks #onted #ENG2D

aledaklassen's tweet image. This was an encouraging email to receive this weekend!

#btcthinks
#onted
#ENG2D

Sometimes, integrating technology in a thinking classroom can help boost student exploration and insight. Here, grade 8 #geometry Ss working on determining their linear speed (mi/hr) caused by Earth’s 🌍 rotation: youtube.com/shorts/AmDthkm… @pgliljedahl #btcthinks

TimBrzezinski's tweet image. Sometimes, integrating technology in a thinking classroom can help boost student exploration and insight. Here, grade 8 #geometry Ss working on determining their linear speed (mi/hr) caused by Earth’s 🌍 rotation: youtube.com/shorts/AmDthkm… @pgliljedahl #btcthinks

I've been taking a @BTCthinks approach to teaching English this year. Here's a task we did to uncover informal/personal essay writing processes: Thinking about the Thinking behind Informal Essay Writing: aledaklassened.wordpress.com/2025/04/18/662/ #btcthinks @pgliljedahl #onted #ENG2D


Math Ts: @GraspableMath is an absolute GAME CHANGER when it comes to helping students who struggle with procedural fluency in algebra — especially when they’re using algebra in other math courses! Check it out: youtube.com/shorts/42jCG7_…. Great for CYU Qs! @pgliljedahl #BTCthinks

TimBrzezinski's tweet image. Math Ts: @GraspableMath is an absolute GAME CHANGER when it comes to helping students who struggle with procedural fluency in algebra — especially when they’re using algebra in other math courses! Check it out: youtube.com/shorts/42jCG7_…. Great for CYU Qs! @pgliljedahl #BTCthinks

Great chance to win everything you need to build a thinking classroom. #BTCThinks @BTCthinks @Wipebook

📷 Building Thinking Classroom Giveaway! 📷 Win a full pack to build your thinking classroom! 📷 Here’s how to enter: 1. Sign up here: wipebook.com/btcgiveawayX 2. Follow @Wipebook and @BTCthinks on social media 3. Tag a friend who loves BTC—your friend must follow both accounts…

Wipebook's tweet image. 📷 Building Thinking Classroom Giveaway! 📷

Win a full pack to build your thinking classroom! 📷 Here’s how to enter:

1. Sign up here: wipebook.com/btcgiveawayX
2. Follow @Wipebook and @BTCthinks  on social media
3. Tag a friend who loves BTC—your friend must follow both accounts…


I've been trying to implement more of the #btcthinks framework this year. I think I've adopted & adapted a routine that helps students understand where they are, where the need to go, and how to get there. It's not perfect. #thinkingclassroom #onted aledaklassened.wordpress.com/2025/03/30/my-…


Freshmen Civics scholars at Propel Andrew Street became lawmakers in this Pass the Bill lesson, tackling issues of internet safety, climate change & education reform. Using #BTCThinks they collaborated, debated & voted. The future is bright! #RedefineSchool #DefyExpectations

PropelSchools's tweet image. Freshmen Civics scholars at Propel Andrew Street became lawmakers in this Pass the Bill lesson, tackling issues of internet safety, climate change & education reform. Using #BTCThinks they collaborated, debated & voted. The future is bright! #RedefineSchool #DefyExpectations
PropelSchools's tweet image. Freshmen Civics scholars at Propel Andrew Street became lawmakers in this Pass the Bill lesson, tackling issues of internet safety, climate change & education reform. Using #BTCThinks they collaborated, debated & voted. The future is bright! #RedefineSchool #DefyExpectations
PropelSchools's tweet image. Freshmen Civics scholars at Propel Andrew Street became lawmakers in this Pass the Bill lesson, tackling issues of internet safety, climate change & education reform. Using #BTCThinks they collaborated, debated & voted. The future is bright! #RedefineSchool #DefyExpectations

If you’re looking for online summer PD to boost student thinking and engagement, I am leading two live-virtual BTC cohorts with @RocketPD this July/August - one on Math and the other Cross-Curricular. Join me in getting students to think. #BTCthinks rocketpd.com/instructor/dr-…


Here, a powerful example that helps show how & why traditional grading is ineffective. youtube.com/shorts/hzcVlsX… @pgliljedahl @BTCthinks #BTCthinks

TimBrzezinski's tweet image. Here, a powerful example that helps show how & why traditional grading is ineffective.  youtube.com/shorts/hzcVlsX… @pgliljedahl @BTCthinks #BTCthinks

Grading in a thinking classroom: Insightful discussions yesterday at @ATMIM_Updates annual conference. youtube.com/shorts/2KnmkMA… @pgliljedahl @btcthinks #BTCthinks


The sweet sound of BTC in action. #mineolaproud #BTCthinks


Recently spotted at a workshop in Oslo. #BTCthinks #thinkingclassrooms

pgliljedahl's tweet image. Recently spotted at a workshop in Oslo. #BTCthinks #thinkingclassrooms

#mineolaproud of the engagement and conversations these Ss put in taking the test “again” with a random partner before getting their tests back. #BTCthinks

staci_durnin's tweet image. #mineolaproud of the engagement and conversations these Ss put in taking the test “again” with a random partner before getting their tests back. #BTCthinks
staci_durnin's tweet image. #mineolaproud of the engagement and conversations these Ss put in taking the test “again” with a random partner before getting their tests back. #BTCthinks

Working on @mccainm's & my 2nd (& new) BTC presentation entitled "Seeing Grading in a Thinking Classroom in Action". We'll even carry out a quick simulation! Excited to facilitate this new workshop at the BTC conference & at future conferences! @pgliljedahl @BTCthinks #BTCthinks

TimBrzezinski's tweet image. Working on @mccainm's & my 2nd (& new) BTC presentation entitled "Seeing Grading in a Thinking Classroom in Action". We'll even carry out a quick simulation! Excited to facilitate this new workshop at the BTC conference & at future conferences! @pgliljedahl @BTCthinks #BTCthinks

Twelve Days of Christmas thinking task. Finding out how many total gifts after 12 days and noticing many number patterns while doing so. #BTCthinks #makingmathfun

staci_durnin's tweet image. Twelve Days of Christmas thinking task. Finding out how many total gifts after 12 days and noticing many number patterns while doing so. 
#BTCthinks #makingmathfun
staci_durnin's tweet image. Twelve Days of Christmas thinking task. Finding out how many total gifts after 12 days and noticing many number patterns while doing so. 
#BTCthinks #makingmathfun
staci_durnin's tweet image. Twelve Days of Christmas thinking task. Finding out how many total gifts after 12 days and noticing many number patterns while doing so. 
#BTCthinks #makingmathfun

So #Mineolaproud of this learner! Using resources to understand a skill. #neuronsticker #BTCthinks

staci_durnin's tweet image. So #Mineolaproud of this learner! Using resources to understand a skill. #neuronsticker #BTCthinks

It’s been awhile. BTC in action! #mineolaproud to see the engagement and hear the discussions amongst the groups. #BTCthinks #mathtalk

staci_durnin's tweet image. It’s been awhile. BTC in action! #mineolaproud to see the engagement  and hear the discussions amongst the groups. #BTCthinks #mathtalk
staci_durnin's tweet image. It’s been awhile. BTC in action! #mineolaproud to see the engagement  and hear the discussions amongst the groups. #BTCthinks #mathtalk

Lots of interest at our intro to #btcthinks today at #btcc24. So much thinking, conversation, persistence, and reflection. @jared_sliger

aledaklassen's tweet image. Lots of interest at our intro to #btcthinks today at #btcc24.

So much thinking, conversation, persistence, and reflection.

@jared_sliger

Had a great time facilitating a workshop about getting the English class vertical. We explored vocabulary, composition, reading fluency, all in an integrated way. #btcc24 @btcthinks #btcthinks

aledaklassen's tweet image. Had a great time facilitating a workshop about getting the English class vertical. We explored vocabulary, composition, reading fluency, all in an integrated way. 

#btcc24 
@btcthinks
#btcthinks
aledaklassen's tweet image. Had a great time facilitating a workshop about getting the English class vertical. We explored vocabulary, composition, reading fluency, all in an integrated way. 

#btcc24 
@btcthinks
#btcthinks
aledaklassen's tweet image. Had a great time facilitating a workshop about getting the English class vertical. We explored vocabulary, composition, reading fluency, all in an integrated way. 

#btcc24 
@btcthinks
#btcthinks

.@JudytaLarsen and I had lots of fun planning for & facilitating a workshop at #btcc24 that went beyond math. Cross-contamination & double dipping gave lots to debate and think about...from gross factors to social acceptability to designing experiments. #btcthinks @BTCthinks

aledaklassen's tweet image. .@JudytaLarsen and I had lots of fun planning for & facilitating a workshop at #btcc24 that went beyond math. Cross-contamination & double dipping gave lots to debate and think about...from gross factors to social acceptability to designing experiments. 

#btcthinks
@BTCthinks
aledaklassen's tweet image. .@JudytaLarsen and I had lots of fun planning for & facilitating a workshop at #btcc24 that went beyond math. Cross-contamination & double dipping gave lots to debate and think about...from gross factors to social acceptability to designing experiments. 

#btcthinks
@BTCthinks
aledaklassen's tweet image. .@JudytaLarsen and I had lots of fun planning for & facilitating a workshop at #btcc24 that went beyond math. Cross-contamination & double dipping gave lots to debate and think about...from gross factors to social acceptability to designing experiments. 

#btcthinks
@BTCthinks

I am so pleased to announce that BTC is now available in French. Merci @fredouellet0 for all your hard work and advocacy for this translation! #BTCthinks

pgliljedahl's tweet image. I am so pleased to announce that BTC is now available in French. Merci @fredouellet0 for all your hard work and advocacy for this translation! #BTCthinks

Math is Messy! Math is Hard! It’s supposed to be. #mineolaproud #BTCthinks

staci_durnin's tweet image. Math is Messy! Math is Hard! It’s supposed to be. #mineolaproud #BTCthinks

It was great to get up at the boards and thinking to start our new unit. #BTCthinks #mineolaproud

staci_durnin's tweet image. It was great to get up at the boards and thinking to start our new unit. #BTCthinks #mineolaproud
staci_durnin's tweet image. It was great to get up at the boards and thinking to start our new unit. #BTCthinks #mineolaproud
staci_durnin's tweet image. It was great to get up at the boards and thinking to start our new unit. #BTCthinks #mineolaproud
staci_durnin's tweet image. It was great to get up at the boards and thinking to start our new unit. #BTCthinks #mineolaproud

First week of school and you’re so engrossed in task that you stay inside during bell break. #BTCthinks #mineolaproud

staci_durnin's tweet image. First week of school and you’re so engrossed in task that you stay inside during bell break. #BTCthinks #mineolaproud
staci_durnin's tweet image. First week of school and you’re so engrossed in task that you stay inside during bell break. #BTCthinks #mineolaproud
staci_durnin's tweet image. First week of school and you’re so engrossed in task that you stay inside during bell break. #BTCthinks #mineolaproud

#BTCthinks in Science! Discovering Newton’s Laws of Motion #mineolaproud of the Ss collaboration with each other.

staci_durnin's tweet image. #BTCthinks in Science! Discovering Newton’s Laws of Motion #mineolaproud of the Ss collaboration with each other.
staci_durnin's tweet image. #BTCthinks in Science! Discovering Newton’s Laws of Motion #mineolaproud of the Ss collaboration with each other.
staci_durnin's tweet image. #BTCthinks in Science! Discovering Newton’s Laws of Motion #mineolaproud of the Ss collaboration with each other.
staci_durnin's tweet image. #BTCthinks in Science! Discovering Newton’s Laws of Motion #mineolaproud of the Ss collaboration with each other.

What’s better than getting up and thinking on a Monday! Great way to start our week! #Mineolaproud #BTCthinks

staci_durnin's tweet image. What’s better than getting up and thinking on a Monday! Great way to start our week! #Mineolaproud #BTCthinks
staci_durnin's tweet image. What’s better than getting up and thinking on a Monday! Great way to start our week! #Mineolaproud #BTCthinks
staci_durnin's tweet image. What’s better than getting up and thinking on a Monday! Great way to start our week! #Mineolaproud #BTCthinks
staci_durnin's tweet image. What’s better than getting up and thinking on a Monday! Great way to start our week! #Mineolaproud #BTCthinks

Look at this focus… not an easy task today. So #mineolaproud of everyone today. #BTCthinks #persistence

staci_durnin's tweet image. Look at this focus… not an easy task today. So #mineolaproud of everyone today. #BTCthinks #persistence
staci_durnin's tweet image. Look at this focus… not an easy task today. So #mineolaproud of everyone today. #BTCthinks #persistence

At least my Amazon boxes are being put to good use! Discovering Surface Area and Nets without realizing they’re discovering Surface Area and Nets. #BTCthinks #BuildingThinkingClassrooms

staci_durnin's tweet image. At least my Amazon boxes are being put to good use! Discovering Surface Area and Nets without realizing they’re discovering Surface Area and Nets. #BTCthinks #BuildingThinkingClassrooms
staci_durnin's tweet image. At least my Amazon boxes are being put to good use! Discovering Surface Area and Nets without realizing they’re discovering Surface Area and Nets. #BTCthinks #BuildingThinkingClassrooms
staci_durnin's tweet image. At least my Amazon boxes are being put to good use! Discovering Surface Area and Nets without realizing they’re discovering Surface Area and Nets. #BTCthinks #BuildingThinkingClassrooms

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