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Two proofs of the Pythagorean theorem and the proof that one U.S. President submitted as a unique proof 5 years before his presidency.

submitted 3 hours ago • 0 comments

Tutorial on how to draw a square with just 3 lines:

submitted 20 hours ago • 3 comments

Variables are more appealing when they're emojis

submitted 1 day ago • 0 comments

Two ways we can solve this popular puzzle

submitted 1 day ago • 1 comment

Today's teaching win: Students were working on a problem for about 20 minutes until I told them class is almost over. They didn't want to leave and they didn't want to be told the answer, so they stayed after class until they got it.

submitted 2 days ago • 3 comments

Pro-tip: If you have to do a 2,000 word essay, just submit two pictures because a picture is worth 1,000 words.

submitted 2 days ago • 2 comments

Have you ever wondered why perpendicular lines have slopes that are opposite reciprocals of each other? Here's how we can think about it!

submitted 3 days ago • 3 comments

It's Mental Math Monday with guest Nicole from Minnesota! If 2/5 of a number is 70, how would you mentally calculate what the number is?

submitted 5 days ago • 10 comments

This challenge is going to break phones lol

submitted 5 days ago • 2 comments

A real-world math problem I had last year: Can you make 33 with 0s, 5s, 7s, and 9s? Let me know how you would do it!

submitted 6 days ago • 11 comments

Pronouncing polygonal, pentagonal, hexagonal, and octagonal

submitted 7 days ago • 3 comments

Thank you, Minnesota math teachers! It is a huge honor to share with you. I swear, I feel like I am my happiest self when I am in the Midwest.

submitted 7 days ago • 1 comment

What an honor it was to do a joint keynote with Graham Fletcher at the Minnesota math leadership symposium. The people of Minnesota are giving me another reason why I absolutely love the Midwest.

submitted 8 days ago • 1 comment

Fraction division CAN be understandable! Here are 3 ways we can think about it.

submitted 8 days ago • 3 comments

Dreams really do come true! I am so happy to announce that I am now a math instructor at The University of Minnesota! Go Golden Gophers! I didn't get a job here or anything. I'm just a math instructor physically on their campus.

submitted 9 days ago • 6 comments

I turned my most boring math lesson into one of my most engaging ones. Here's how:

submitted 10 days ago • 0 comments

For today's Mental Math Monday, how would you mentally calculate 7% of 250?

submitted 12 days ago • 23 comments

Listen, I'm ALL about math jokes. I make them all the time. But jokes about the distributive property are NOT funny. Unless everyone gets it.

submitted 14 days ago • 7 comments

Can you figure out the fewest number of marks needed on this ruler? (I think this would be a great math task!)

submitted 14 days ago • 4 comments

This pattern with infinite series is not a coincidence. Also, 1+2+4+8+...=-1??? (I don't have a good title for this one but I think it's good lol)

submitted 15 days ago • 0 comments

Evaluating fractional exponents

submitted 16 days ago • 5 comments

I started doing this thanks to Howie’s posts, and it made a big impact on how my students felt about test taking!

submitted 17 days ago • 2 comments

For the first 5 minutes of a test, I tell students to put their writing utensils on the ground, I hand out the test, and they can talk to each other while holding the tests. Students shared how much this lowers their testing anxiety and you hear some of the best mathematical conversations.

submitted 17 days ago • 4 comments

Science has "the mitochondria is the powerhouse of the cell." If math had one iconic line, what would it be?

submitted 18 days ago • 20 comments

It's Mental Math Monday! How would you mentally calculate 37×25?

submitted 19 days ago • 23 comments

Switch 2 this, Switch 2 that, how about you Switch 2 degree mode on your calculator when doing trig?

submitted 20 days ago • 0 comments

How many holes on top of this salt shaker? How did you count?

submitted 21 days ago • 37 comments

Can you calculate the perimeter of this figure?

submitted 21 days ago • 1 comment

Does the Monty Hall problem apply to Deal or No Deal?

submitted 22 days ago • 0 comments

Chat, is this real?

submitted 22 days ago • 13 comments

Finding 1/2 + 1/4 + 1/8 + 1/16 + ... by drawing:

submitted 23 days ago • 0 comments

Did you know we can derive the area formula of a circle from a rectangle?

submitted 24 days ago • 7 comments

Don't be tricked by this math problem! There are 2 common answers to this but only one is correct. Which is it and why?

submitted 25 days ago • 3 comments