Ride sharing apps like Uber calculate your fare using mathematical modeling. What info do they need to make a fair estimate (Spies) and what would they do with that info to calculate the dollar amount (Analysts)? robertkaplinsky.com/math-mo...

Want to challenge your 8th grade or Geometry students? This lesson uses an intriguing picture of a lawn with circles on it to talk about solutions that will water all of the grass. robertkaplinsky.com/work/wa...

If you're a teacher who works outside the classroom, you must read this blog post. I spent eight years as a math teacher specialist at a public school district and sometimes it felt like purgatory. Here's what I've learned during that time. robertkaplinsky.com/what-iv...

Are you an elementary teacher looking for some images you can bring into your math classroom to get kids talking? Check out Math Visuals from Berkeley Everett: mathvisuals.wordpress.com/

Tired of students getting correct answers, yet not really understanding what they're doing? Then you should check out the recording of my How To Help Students Become Problem Solvers, Not Math Robots webinar with K-5 & 6-12 versions. robertkaplinsky.com/norobot...

Want to challenge your Geometry students to find the area of triangles? Try out this Open Middle problem from Dan Wulf. www.openmiddle.com/area-of-...

Looking for a real world context for multiplying and dividing decimals? Check out my problem-based lesson called How Much Money Do You Earn For 1,000,000 Streams On Spotify? robertkaplinsky.com/work/ho...

Who else has read the Dungeon Crawler Carl book series besides @sweenwsweens.bsky.social? I'm literally addicted to it. Like I don't want to work or do anything but read the rest of book 5. I am not looking forward to the withdrawal that will come when there are no more books to read. 😱😱💀💀☠️☠️

Could having the same person teach students AND make the assessments lead to false positives results? robertkaplinsky.com/fire-ex...

Here's a challenging Open Middle problem to help students develop conceptual understanding of quadratics in standard form: www.openmiddle.com/maximum-...

Here's a lesson to help elementary students apply their skills with perimeter, measurement, and scale by finding how many laps around a park it takes to run a 5k race. robertkaplinsky.com/work/5k...

If you've wanted to teach math using real-world and Open Middle problems but want support getting started, then this is the workshop for you. Learn more about Robert Kaplinsky's @robertkaplinsky.com Empowered Problem Solving online workshop at grassrootsworkshops.com/wor...

If your Geometry students are working on the midpoint formula, try out this Open Middle problem from Dane Ehlert with them. www.openmiddle.com/midpoint...

If you're tired of people saying that they lecture in middle school to prepare students for more lecture in high school and college, then you may enjoy my thoughts on this (absurd) topic. robertkaplinsky.com/prepare...

How do you count money when there was so much that it was “world's largest drug bust?” This is a great opportunity to help students develop and apply using volume of rectangular prisms. robertkaplinsky.com/work/dr...

I asked 383 US math teachers if they had enough time to teach all their standards in one year. Here's what they said: robertkaplinsky.com/enough-...

This 7-minute video on early numeracy and counting from Graham Fletcher is perfect for Pre-K to 1st grade teachers. gfletchy.com/progression-of...

Do you present to other educators or aspire to? I created a webinar where I go through my entire presentation creation process from start to finish. For example, I use this three circle Venn diagram to help me choose a topic. Watch it here: https://info.robertkaplinsky.com/captivating/

Are your students working on parallel and perpendicular lines? Try out these two Open Middle problems from Bryan Anderson: www.openmiddle.com/equation... www.openmiddle.com/equation...

How many movies can you see in one day? This lesson is perfect for third and fourth graders who are working on operations with time. I've included four different movie schedule options that range from easy to very challenging. robertkaplinsky.com/work/mo...

I think that many schools and districts have mission and vision statements that are essentially useless but no one wants to admit it. Read more: robertkaplinsky.com/read-th...

Can your high school students create a parallelogram, triangle, or rectangle by listing their points when given one? Find out using these three Open Middle problem from Bryan Anderson. www.openmiddle.com/creating... www.openmiddle.com/creating... www.openmiddle.com/creating...

If you also like a good prank, then you'll love this lesson on surface area. It uses the aluminum foil prank to figure out how much it would cost to cover a room of your choosing. It's a great way to build conceptual understanding using nets. robertkaplinsky.com/work/fo...

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

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...