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How can Nike give away so much great stuff?
How can Nike give away so much great stuff?

Worldwide Nike supports many teams and athletes. They design, manufacture, and supply gear for almost every sport imaginable. How much are those give-aways worth? Is the company going...

Algebra Number Sense Grades 4–HS
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
Pythagorean Triples and coloring
Pythagorean Triples and coloring

Pythagorean triples are not only handy for students to recognize but produce some interesting and lovely patterns. We've combined a little coloring with our Pythagorean Triple pattern investigation...

Algebra Number Sense Grades 6–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
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