Robert Kaplinsky
banner
robertkaplinsky.com
Robert Kaplinsky
@robertkaplinsky.com
2K followers 190 following 250 posts
Math educator. Love helping teachers. Open Middle co-founder. #OpenMiddleBook author. #ObserveMe creator. Grassroots Workshops President. Get lessons & ideas: http://bit.ly/rkupdates
Posts Media Videos Starter Packs
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...
When we invest a lot of time and energy into something, it can be hard to let it go, even when we should. This is especially true in education when an initiative doesn't give us the results we had hoped for.

Read more here: robertkaplinsky.com/behavio...
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...
Here are some of my successes and challenges with implementing Depth of Knowledge as well as resources you can use.

robertkaplinsky.com/how-i-i...
If you're looking for an incredibly captivating set of images for counting, talking about units, how many you see, number talks, and countless other reasons, please check out the mesmerizing art from Adam Hillman at www.instagram.com/witenry/
If you're an educational consultant who trains other educators, you should join the over one thousand consultants in our community. It's a place to give and get advice from others who get what you're going through.

www.facebook.com/groups/edc...
I'm not familiar with that.
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-...
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...
Reposted by Robert Kaplinsky
I am vaccinated. I also value herd immunity, so get your shots, please!
“Vaccines are not just for disease prevention, but it’s also to prevent you from getting a severe form of the disease (if you get infected) that sends you to the hospital or worse. Flu every year and Covid every year still cause significant mortality in the country.”
www.cnn.com/2025/10/15/h...
Respiratory virus season has arrived. What to know about getting this year’s vaccines | CNN
It’s that time of year when the leaves are turning golden, there’s a chill in the air and the threat of respiratory viruses like Covid-19, influenza or RSV looms across the country.
www.cnn.com
I'm part of a math TOSA network with ~200 members that's met bi-monthly for since 2013. Here's how you can make your own.

robertkaplinsky.com/categor...
Help your students think deeply about radicals with this Open Middle problem from Phillip Haislip-Hansberry. www.openmiddle.com/comparin...
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 your students are learning about perpendicular lines, try out this Open Middle problem from Andy Schwen with them: www.openmiddle.com/perpendi...
Really interesting slide from Peter Liljedahl and @themathguru.bsky.social at #NCSM25.
The California Department of Education published a great resource about what is frequently thought of as math modeling but is NOT.

Read more here: robertkaplinsky.com/what-is...
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...
If you completely remove a problem's context and can still solve it, can it really be mathematical modeling?

robertkaplinsky.com/beware-...
Here's a way to get kids noticing and wondering about angle measures!
Math worksheets rarely give us the results we truly want. There's a better way and I recorded a webinar with elementary and secondary versions that you can watch to learn more.

robertkaplinsky.com/worksheets
Reposted by Robert Kaplinsky
We're learning about AI and reconsidering what we should be teaching with @robertkaplinsky.com at #nwmc_Tacoma.
If your high school students are working on adding vectors, try out this Open Middle problem from Bryan Anderson. www.openmiddle.com/adding-v...
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...
What can the differences between programming a remote control and learning how to drive teach us about problem solving?

robertkaplinsky.com/is-prob...