What me? Irrational?
We've found that some students believe that the approximation that their calculators show for irrational numbers is exact. Here's an activity that you can advertise as long multiplication ...
Number Sense
Genres
Grade
Pizza party figuring
In this activity students decide how to divide 2 pizzas amongst 6 adults and 3 pizzas amongst 8 kids. Fractional pizza parts need to be drawn and considerations discussed about which f...
Want to earn $150,000? - Mersenne prime search
What's a Mersenne prime? How hard could it be to find the next one?
Why are there only 50 known Mersenne primes? What's with $150,000?
Big Air snowboarding
Starting February 18th a new Olympic sport will be televised ... Big Air Snowboarding. Some of your students may be officianados of snowboarding. Using this activity could be an opportunity to l...
Is this promo a good deal?
McDonald's was offering an "Arch Card" special deal. If you bought an Arch Card for $100 you were entitled to a free BigMac or EggMcMuffin every week for a full year. The card was only offered a...
Holiday candy sales
This activity has been updated. Please see the updated post:
Population Clock
How in the world does this clock conclude that there is a net gain in the United States of one person every 14 seconds?
Have a little care about younger children when using this activity. T...
Layla's antibiotics
Layla
The dosage of Layla's medication was confusing to our friend Kim. How many days was she supposed to give Layla the meds?
How many pills does she need to cut into pie...
How much does the biggest Lego set ever cost?
Picture from the Verge. Click to see the story.
Note: This is a remake of our 2014 "How Much Does a Lego Cost" activity
How much could the...
Proposed southern border wall
You have probably heard about the proposed border wall that may go up along the U.S./Mexico border. How much wall needs to be built? How much will that cost? What is that per mile? Per foo...