Convergent geometric series are cool!

This one raised some eyebrows on both TikTok and Instagram earlier today.

One way that suggests why
0.999999999…(repeating infinitely) is not almost, but EXACTLY equal to 1

BTC #math Ts: Looking for ex's of basic, intermediate, and advanced Qs where Ss can individually demonstrate knowledge of any of these concepts? Have a look: docs.google.com/presentation/d….

More re: grading in a thinking C: tinyurl.com/BTCrubric Peter Liljedahl Melisa McCain Building Thinking Classrooms

Conics, tangents, and angles.

Found this old GeoGebra file from a few years ago. AR was a fun fad back then, and I still have Ss use it sometimes when modeling in 3D. We then use AR to virtually test the accuracy of these models. geogebra.org/m/zfnt8hdc #MTBoS #ITeachMath

Circle to triangle in #Polypad polypad.amplify.com/p/cla6awxKTE52… Mathigon Amplify Desmos Classroom #MTBoS #ITeachMath

Do you wish 1 radian = 60° ? geogebra.org/m/avxxzkyz GeoGebra #MTBoS #ITeachMath

Constructing angles whose measures are given in RADIANS conceptually: tinyurl.com/buildrads GeoGebra #MTBoS #ITeachMath

Trig identity shown graphically geogebra.org/m/hhkrmdbb GeoGebra #MTBoS #ITeachMath

Working with dot product at a higher level. Activities for students: geogebra.org/m/hhnxdxug & geogebra.org/m/z9zxdz3a GeoGebra #MTBoS #ITeachMath

Had an awesome co-presenter today at VCTM 2024 conference! He worked my Google Slides presentation remotely behind-the-scenes. 🙂 Melisa McCain Peter Liljedahl

.VCTM annual conference has begun! BScribMather (He/Him) #VermontMath #VermontMath 24

Facilitating a #ThinkingClassroom workshop tomorrow at VermontMath annual conference. Since my oldest (12) is on spring break this week, we decided to make a 2-day road trip out of it with lots of fun activities along the way.

New tile announcement! Snap cubes have come to Polypad! Explore for yourself at polypad.amplify.com/p#number-tiles

Excited to co-facilitate 2 BTC sessions at the
Building Thinking Classrooms conf (c/o AZ Math Leaders) w/Melisa McCain in Phoenix 7/1 - 7/2!

Our 2 sessions will focus on grading for a TC. We'll even discuss authoring objectives & experience a live demo of the grading process in action. Peter Liljedahl

Love this animation by Jerome White . Here’s what it looks like in AR on GeoGebra #3D Calculator:

Surface area of a sphere in GeoGebra (equal to area of four circles of equal radius) geogebra.org/m/cbzg7ghq

We've released improvements to the Graspable Math notation! ✨
Number 1: Support for the division symbol '÷'. This has been on our list for a long time, and of course it includes new gestures to work with division, too.
Try it yourself here: activities.graspablemath.com/whiteboards/_f…

The upcoming Solar eclipse is only one reason to visit Vermont in April. vctm.wildapricot.org/event-5532022 Join a powerful group of speakers for a rich day of math. Tim Brzezinski Megan Staples, Amy Chang (they/them) Building Thinking Classrooms Exemplars ATMNE Math NCTM

Volume a sphere. GeoGebra graphic created by the amazing Anthony Or 柯志明 : geogebra.org/m/vn4daAZ4 #MTBoS #ITeachMath #geometry