Are your high school students working with complex numbers? Try these two Open Middle problems out to see what misconceptions they have:
www.openmiddle.com/complex-...
www.openmiddle.com/complex-...

I'm a huge fan of the research around growth mindset, but there is one part that I'd like to explore: do you really learn from mistakes that you're not aware of?

robertkaplinsky.com/really-...

A homeowner beautifully tiled her floor with about 13,000 pennies. Everyone thought it was wonderful... but then people complained on social media about how she wasted $13,000! 🤦‍♂️

robertkaplinsky.com/work/mu...

Taking a steak cooking class taught me a valuable lesson about instructing students. We don't want to overcook them!

More here in this short post: robertkaplinsky.com/heres-i...

I learned so much about introversion and shyness from Mary Bourassa's Ignite talk and her recommendation of the book Quiet by Susan Cain (such a great book!). I had never reflected on how biased life is towards outgoing extroverts.

Watch her talk: www.youtube.com/watch?v=Yvm...

If you teach others through online workshops, then you should check out my webinar recording on 6 counterintuitive lessons learned I wish I had understood earlier. For example, should workshops feel more like watching Netflix or traditional TV?

robertkaplinsky.com/pdwebinar

Help your students think deeply about radicals with this Open Middle problem from Phillip Haislip-Hansberry. www.openmiddle.com/comparin...

Can your students figure out which Michaels coupon will save them the most money? Is it the 30% off their entire purchase or 40% off of one item?
robertkaplinsky.com/work/mi...

What can the process of moving out of a home teach us about revising our curriculum maps / pacing guides to something more doable?

robertkaplinsky.com/moving-...

If your students are learning about perpendicular lines, try out this Open Middle problem from Andy Schwen with them: www.openmiddle.com/perpendi...

This skytyping lesson gives a real world context for all four transformations: reflections, translations, rotations, and dilations and their implementation using algebraic notation.

robertkaplinsky.com/work/sk...

If your high school students are working on adding vectors, try out this Open Middle problem from Bryan Anderson. www.openmiddle.com/adding-v...

Athletes who have prepared for an even often say that things "slow down" and they can better anticipate moves. Educators can do the same thing:

robertkaplinsky.com/sports-...

Most theme park rides have height restrictions. Sometimes you have to be taller, sometimes shorter, and sometimes in between two heights. These restrictions are a great way to introduce the idea of inequalities such as greater than and less than.

robertkaplinsky.com/work/ri...

Thank you to HMH for bringing Robert Kaplinsky @robertkaplinsky.com to the MCTM Spring Conference. Register here www.mctm.org/event-6284136

Thank you, Benjamin.

Yeah they're at an enormous scale.

Thanks for the heads up.

If you've ever thought that a student understood something only to find out you were wrong, then you'll enjoy this short post with a twist.

robertkaplinsky.com/know-ki...

Fawn Nguyen has yet another resource for math teachers. Between 2 Numbers helps students practice their estimation and number sense skills by trying to determine the best answer to the prompt. It's in English and French too! www.between2numbers.com/

If you have a website (or are planning on making one), you should check out my webinar on three things your website should include and one you should avoid.

The examples are specific to educational consulting, but apply to all websites.

info.robertkaplinsky.com/we...

Here's a matrix multiplication problem from Bryan Anderson that will help you bring out their conceptual understanding. See hints and answers on Open Middle. www.openmiddle.com/matrix-m...

Check out these tires! If they're bigger than an SUV or a semi trick, then how big is the vehicle that uses it?!?! This lesson is great for seventh graders studying proportions.

robertkaplinsky.com/work/ti...

I spent most of my high school years living in a group home. I usually try to avoid talking about it, but I realize that I have a perspective that might be helpful for other educators. So, here's what I wish teachers knew.

robertkaplinsky.com/wish-te...

Algebra teachers, check out these three rational exponent problems from Bryan Anderson. See the hints and answers on Open Middle:
www.openmiddle.com/rational...
www.openmiddle.com/rational...
www.openmiddle.com/rational...

Apple made a screen that was so sharp they called it a "retina display" because the pixels were so small that they couldn't be seen by a human retina. have students use the Pythagorean Theorem to calculate the screen's pixel density.

robertkaplinsky.com/work/re...

Are your students working on radical equations? This Open Middle problem from Jonathan Newman will challenge their understandings! www.openmiddle.com/radical-...

Should superintendents, principals, and other educational leaders be more like a Chess Master or a Gardener? It depends on whether you want someone who dictates your every move or nurtures you so you can grow and thrive.

robertkaplinsky.com/leaders...

This engaging STEM lesson about sunspots requires middle school students to incorporate a variety of skills to precisely describe their attributes.

robertkaplinsky.com/work/su...

The #ObserveMe movement started in 2016 and thousands of teachers all over the world have participated. Here's what I've learned.

robertkaplinsky.com/reflect...