Playlist: Theodore
Broken Calculator: Multiplication Cross Product
This calculator multiplies almost correctly. Students will find the one step it skips.
Broken Calculator: 2-Digit Addition
This calculator adds two-digit numbers wrong, the same way every time. Crack the rule, then predict its next mistake.
Broken Calculator: 2-Digit Subtraction
This calculator gets subtraction wrong the same way every time. Can your students crack its broken rule?
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?
Super Specific Similes: Loud Class
Let’s make this simile about a loud class super specific!
Plant Adaptation Tournament
Who will win in a tournament of eight plants with Interesting adaptations!?
How Many Will There Be? Triangles Within Triangles
A triangle splits and splits and splits again. How many will there be in step 20?
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?