Playlist: Theodore

Broken Calculator: 2-Digit Addition

Broken Calculator: 2-Digit Subtraction

Mother’s Day Cards

Let’s write the cleverest Mother’s Day cards you’ve ever seen!

Grouping Shapes by Parallel and Perpendicular Sides

Which shapes go together based on parallel and perpendicular lines?

Plant Adaptation Tournament

Who will win in a tournament of eight plants with Interesting adaptations!?

What If There Were No Hundreds Place?

Imagine a world with no hundreds place. We’d have to call it ten tens instead. But then, what would we call the thousands place? How would we read 9999? What if we added one more?

Chomp

Chomp away at your opponent in this grid-based strategy game.

Place Value (Beyond Base 10)

Place value is something we cover in elementary school. It seems simple, but I’d wager that very few adults really understand the topic. I sure didn’t until I worked with non-base-10 number systems in college. Your students can get a taste of this mind-boggling experience by imagining what it would be like if we didn’t have the number 9. What would each digit represent then?

Visualizing Fraction Multiplication

What does it look like to multiply fractions?

A Visual Guide To Dividing By Fractions

Have you ever wondered what it looks like to divide by a fraction, man?