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What me?  Irrational?
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 Grades 4–7
Pizza party figuring
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...

Number Sense Geometry Grades 3–5
Want to earn $150,000? - Mersenne prime search
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?

Algebra Number Sense Grades 4–HS
Big Air snowboarding
Big Air snowboarding

Starting February 18 th a new Olympic sport will be televised ... Big Air Snowboarding. Some of your students may be officianados of snowboarding. Using this activity could...

Number Sense Geometry Grades 5–HS
Super Bowl ads and scientific notation
Super Bowl ads and scientific notation

The Super Bowl is over now and all of the ads have been seen. Let your students revisit and reflect on the interesting commercials with this scientific notation...

Algebra Number Sense Grades 6–HS
Is this promo a good deal?
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...

Number Sense Math and Food Grades 4–6
Spiraling triples
Spiraling triples

Let students explore the patterns of perfect squares and Pythagorean Triples as they analyze our piece of art and decide why the resulting construction looks like spiraling squares....

Number Sense Geometry Grades 6–HS
Is my son going to win again?
Is my son going to win again?

Brian son's pretty young but is he still going to whoop his dad? They were playing Monopoly Junior. Can you decide who will win? In this activity use...

Algebra Number Sense Grades 1–4
Population Clock
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...

Algebra Number Sense Grades 3–7
Layla's antibiotics
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...

Number Sense Grades 4–6
How much does the biggest Lego set ever cost?
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...

Algebra Number Sense Grades 5–6
How many cars are there?
How many cars are there?

Brian came home from work to find that his son had his toy cars organized in a tight parking lot on our front porch. ? Below is a...

Number Sense Geometry Grades 2–4