Playlist: Math
How Many Ways: Divide to 5 (Decimals)
Fill in the blanks so a division comes out to exactly 5.
Bad Graphs: Boulder Throwing
Mr. Boid’s graph says he won in a blowout. But it was really a tie.
Multiply to Find the Smallest Fraction
One equation, digits one through nine, and a hunt for the smallest possible answer.
A Decimal Rounding Surprise
Decimals are the same distance apart. But one pair rounds together and the other splits. Why?
Broken Calculator: Comparing Decimals
This calculator swears 0.5 is less than 0.45. What’s going on here?
How Many Ways: Add Fractions to a Decimal
Three fractions must add to exactly 1.07.
How Many Ways: Two Hundredths Apart
Build a fraction and a decimal that land exactly two hundredths apart.
How Many Ways: A Fraction of a Whole Makes 3
A whole number times a fraction has to equal exactly 3. Which digits work?
How Many Ways: Multiply to 9
Fill in the blanks so two decimals multiply to exactly 9.
How Many Ways: Subtract to 7.5
Fill in the blanks so two decimals land exactly 7.5 apart.
How Many Ways: Add to 5
Fill in the blanks so two decimals add to exactly 5, using each digit only once.
Broken Calculator: Simplifying Fractions
This calculator simplifies fractions with a rule that sometimes works. What is it doing wrong?
What’s In My Brain: H vs Arrow
Two columns. One is an example, one isn’t. Can you figure out the hidden rule before the big reveal?
What’s In My Brain: Pentagon vs Pentagon
We’re looking at regular vs irregular polygons.
Grouping Shapes by Parallel and Perpendicular Sides
Which shapes go together based on parallel and perpendicular lines?
Letters With Symmetry
Let’s group letters by their symmetry, then create symmetrical words, and then symmetrical sentences!
Geometry Image: Victoria Conference Center
What odd and interesting shapes can your students find in this geometric image?
An Olympic Sized Pool and Jet Fuel (Episode 3)
How many times could you fill up a jet plane using the fuel that would fit in an olympic-sized pool?
An Olympic Sized Pool and Lots of Pasta (Episode 2)
How many pounds of pasta could you cook using the water in an olympic-sized pool?
An Olympic Sized Pool and 2 Liter Bottles (Episode 1)
How many 2 liter bottles could you fill up using the water in an olympic-sized pool?
What’s the Pattern? Fraction Addition
Can your students figure out how to add fractions by looking for a pattern?
Find The Pattern: Multiply Fractions
What if you set the stage for students to discover how to multiply fractions?
Olympics: Winter vs Summer Medal Count
Which country has a great balance between their summer and winter Olympic medals?
How Many Ways: Fraction Subtraction 234
How many different ways can you make this fraction subtraction statement true using only the digits one through nine?
How Many Ways: Fraction Addition 234
How many different ways can you make this fraction addition statement true using only the digits one through nine?
How Many Ways: Fractions Multiply 2/3
How many different ways can you make this fraction multiplication statement true using only the digits one through nine?
How Many Ways: Multiply Fractions Equal 1/4
One equation. Digits one through nine. How many ways can you make it work?
How Many Ways: Fraction Subtraction Equals 1/2
How many different ways can you make this math statement true using only the digits zero through nine?
Fractions: Decompose and Recompose
What if we took a fraction apart, then took those pieces apart, then recombined them, and then recombined those, arriving back to the original fraction?
Measurement: An Elephant
What if I told you that an elephant weighed a back-breaking 176,000? Could you figure out the unit I’m using? But… how many corgis would that be?
Measurement: A Long Movie
What if I told you a movie was a whopping 0.017 long? Could you figure out the unit I’m using? This lesson packs in strange measurements of time as well as tiny decimals.
Measurement: How Big is this Bathtub?
So, if I told you a bathtub holds 640 of water, which unit would make the most sense?
Numerator or Denominator: Which has more power in a fraction?
What do you do with students who already get their fraction operations? Give them a contrived project about recipes or pizza slices? Make them solve annoyingly hard practice problems? Please. Here, we get students thinking in a whole new way, pondering which has more power, the numerator or denominator.
Parentheses: How big of a change can they make!?
Two tiny parentheses. One expression. How big of a change can they make? Bigger than you think.
What’s In My Brain: Trapezoids or Not?
Which are trapezoids and which are not?
How Many Ways: Fraction Equivalence
How many different ways can you make this math statement true using only the digits one through nine?
How Many Ways: Order of Operations 1
How many different ways can you make this math statement true using only the digits one through nine?
Fraction Ordering Tournament
Which set of fractions would be the trickiest to order from least to greatest? Let’s have a tournament!
Writing A Story About Fraction Equivalence
When fractions take on a new denominator, it’s as if they’re wearing a disguise – same value, new look. So let’s write a story about fraction equivalence starring a fraction who needs to fit in with a new group.
Same Perimeter, Different Area For Rectangles
Can two rectangles have the same perimeter but… different areas!?
Intersecting Angles and Streets
There can never be just one angle.
Calculators, Patterns, and Multiplying By Decimals
Before teaching students the procedure for multiplying with decimals, how much can they intuitively glean from a structured play session with calculators?
The Angles of a Triangle
Why tell a kid the rules of a triangle when they can discover them!?
Grouping Quadrilaterals In A Hierarchy
Can we classify quadrilaterals like we classify living things?
Lines, Line Segments, Rays, and Infinity!
A lesson about lines, line segments, and rays that avoids dull memorization. Instead, we ponder this delightful question: Which is longer, a ray or a line? Then, kids consider what these different geometric concepts would think about each other.
Finding The Volume of Laptops
How has the volume of laptops changed over time? You know you want to check out how huge those first versions were!
What Does it Cost to Fill a Car with Other Liquids
Is gas actually that expensive? What if we filled a car up with… orange juice?
Visualizing Fraction Multiplication
What does it look like to multiply fractions?
Fraction Puzzlers: Add and Subtract Fractions To Reach A Number
You only have six digits to form three fractions. Can you combine them to get to 0?
A Visual Guide To Dividing By Fractions
Have you ever wondered what it looks like to divide by a fraction, man?
A Grid-Based Fraction Project
You’ve got 60 spaces on a grid to create an amusement park, a house, a farm, or whatever you’d like. Divide it into seven pieces, order it by size, combine into two halves, and more in this fraction project.