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Spiraling squares - compass and straight edge
Spiraling squares - compass and straight edge

Can you see the many spirals in this design? Students calculate the size of each increasing round of squares and consider what sort of spirals these must be....

Algebra Number Sense Grades 6–HS
NHL Playoff games can sure last a long time!
NHL Playoff games can sure last a long time!

Revised! We're watching another Stanley Cup playoff now. Will there be any really long games during the playoffs? In 2013, a Stanley Cup playoff match between the Bruins...

Algebra Number Sense Grades 2–HS
Tornadoes 2019
Tornadoes 2019

Tornadoes have devastated the Midwest, U.S. in the last few days. Alabama, Texas, Louisiana, Oklahoma, Ohio, Missouri, Iowa, Nebraska and Mississippi have been brutally hit with these powerful...

Number Sense Math and Science Grades 5–HS
Wow, everything must be free!
Wow, everything must be free!

What happens when you take 50% off again after taking 50% off at first? Students examine this retailer trick of giving double discounts. What happens to the price...

Algebra Number Sense Grades 5–7
Are baseball games getting longer?
Are baseball games getting longer?

March 28th, 2018 was opening day for this year's Major League Baseball season. It's a good time for some Major League Baseball math! In this activity students think...

Algebra Number Sense Grades 4–HS
Value of a lifetime of Whoppers?
Value of a lifetime of Whoppers?

Locked in a smelly bathroom for one hour and then promised a lifetime of Whopper meals 🍔 , an Oregon man sued BK when the manager's promise was...

Algebra Number Sense Grades 4–7
President's Pay for Presidents' Day
President's Pay for Presidents' Day

You can't run for President now, but heck, 2036 is right around the corner. Being President of the United States will be quite an accomplishment and a ton...

Algebra Number Sense Grades 5–HS
Choosing the NBA All-Star team
Choosing the NBA All-Star team

The weekend of February 14 - 16 will be all about the NBA All-Stars. The two team captains are Giannis Antetokounmpo (Milwaukee Bucks) and LeBron James (Los Angeles...

Algebra Number Sense Grades 4–6
Bowling Deals
Bowling Deals

Is there a general way to figure how much its going to cost you (and your friends) to go bowling? Should you pay per game? Or bowl per...

Algebra Number Sense
Checking in on LeBron
Checking in on LeBron

Now the that season is underway let’s check in on how Cleveland and the Lakers are doing since LeBron changed teams. LeBron is arguably the best player in...

Number Sense Sports Grades 5–HS
Huge diamond found in Canada
Huge diamond found in Canada

552-carat diamond found in Diavik Mine, Northwest Territories, Canada Can you tell just how big this gem is? Do you know how big a carat is? What would...

Number Sense Geometry Grades 4–HS
New Horizons spacecraft just flew by a really distant asteroid
New Horizons spacecraft just flew by a really distant asteroid

Brian May, the lead guitarist of the rock band, Queen, is also an astrophysicist and one of the science team collaborators of the New Horizons space program. The...

Algebra Number Sense Grades 4–HS