If chicken nuggets only came in boxes of 5 and 18, what's the largest order NOT possible?

I wish I was taught this way of finding the greatest common factor when I was in school

How high can we lift the string? If you are teaching the Pythagorean theorem, I highly recommend this problem!

It's Mental Math Monday with guest Jay Cummings. How would you mentally calculate 16+17+18+19+20?

Tonight's trick toss

When dividing by a fraction, a lot of people think about the measurement model, but we can think about the partitive model too! Here's why I think the partitive model is powerful.

TODAY'S THE DAY! It's one of the coolest dates of our lifetime. Whether you go by month/day/year or day/month/year, if we write the date as one number, we will get a square number! Both sides can agree that today's date is a square date. 9,272,025=3045² 27,092,025=5205²

How can we convert a repeating decimal into a fraction?

😱 I was featured on Popular Science! www.popsci.com/science/sept...

Today's date, 9/25/2025, is probably the last date of our lifetime where the month, day, and year are all square numbers 😱 The next time this will happen is on 1/1/2116.

I wish I was taught this way of finding the greatest common factor when I was in school

Common numerators is an underrated strategy for comparing fractions

Wow. Excellent teaching and rhetorical technique! I wish I had a math teacher like Howie!

Would you rather have $200 or a stack of quarters as tall as you? (Redo since there was an error in this morning's video. You also get to see how I have my students revise their mistakes)

Would you rather have $200 or a stack of quarters as tall as you?

How would you explain division? There are two ways we can think about division and understanding these models can help with fraction division.

It's Mental Math Monday! How would you mentally calculate 6+7+8+9?

Did you know that we can visually see why sqrt(40)=2sqrt(10)? Let's see how we can visualize rewriting square roots!

Tonight's trick tosses

How would you find the 100th term of the sequence 3, 7, 11, 15, 19,...? One of my students showed me a strategy I will never forget.

My kindergarten teacher and me, 1997 and today.

Drawing can help make polynomial division easier!

Applying the divisibility rule of 9 feels like a superpower

Create a number where the sum of the digits is a multiple of 9. It is guaranteed that the number you created is a multiple of 9. Here's why this will always work:

Happy 3²/4²/5² ! Here's a cool fact about a 3-4-5 right triangle: The circle that fits perfectly in a 3-4-5 right triangle has an area of pi square units! Here's why.

It's Mental Math Monday! What goes on in your head when you're mentally calculating 112-45?

Tonight's trick toss

A good mental math strategy to have: doubling and halving

Where does the number e come from?

Which is greater: 6⁷ or 7⁶? Let's do it without using a calculator.

Which is greater: 99! Or 50⁹⁹?

Fraction comparison strategy: Same parts away from the whole

Thank you, Irish Mathematics Teachers' Association! It was a joy to share with all of you. :)

This is, in my opinion, one of the most important skills in elementary math

It's Mental Math Monday! How would you mentally calculate 7.5% of 250?

I know this is an unpopular opinion but what if we wrote fraction division like this, at least a couple times? Here's why:

Math teacher here. Why doesn't AC/DC call themselves A/D? 🤔

How to convert into different bases:

How to count in base 2 (binary) on your fingers

One of the staples in my teaching philosophy: Math is so much more than procedures to get the answer

The long division algorithm CAN be understandable and not just a procedure to memorize. Here's how we can make sense of it:

How do we do this "new" way of dividing? youtu.be/as1tsBCBbek?...

Today is a square date! 3²/1²/45² AND if we read it in day/month/year format as one number (1092025), it is a square number!

It's Mental Math Monday! How would you mentally calculate 15×24?

Tonight's trick toss

If you want to be better with multiplication, think about rectangles. Here's what I mean:

Bad math joke

Might be embarrassing to say but I didn't realize exponent and power weren't the same thing until around 5 years ago.

Find your zodiac sign to see if you are a math person 👀

Can you do this math challenge? 👀 (I think this would be a good one for students!)