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Scoring Olympic ski jumping
Scoring Olympic ski jumping

The scoring rubric for each of the Olympic events is intended to eliminate the possibility of scoring bias from the judges. Let your students learn more about the...

Number Sense Geometry Grades 4–HS
Which TV is the Best Deal?
Which TV is the Best Deal?

Check out the TVs. All have essentially the same features, only the size of the screen varies. Which TV do you think is the best deal? Explore area...

Number Sense Geometry Grades 3–6
HDTV Surprise!
HDTV Surprise!

How were your holidays? Your school vacation? Mine was good. I surprised my family with this HDTV, which I wrapped and hung on our wall. The size of...

Number Sense Geometry Grades 6–HS
Really old
Really old

Tom Lehrer is a singer, songwriter, satirist, pianist and mathematician who has written some wonderful songs. In 1959 he wrote a song called “New Math”. At that time,...

Number Sense Math and Social Studies Grades 5–HS
California wildfire
California wildfire

Wildfires are burning in the Sierra Nevada Mountains near Yosemite National Park. In this activity we ask students to examine various maps of this California region, calculate distances...

Number Sense Geometry Grades 4–7
Crop circles
Crop circles

In the travel section of our newspaper this week, Wiltshire, England was a recommended destination to see Stonehendge and crop circles ........... crop circles? Many of the crop...

Algebra Geometry Grades 4–7
Methane math
Methane math

Updated! Carbon dioxide and methane are our two most prevalent human-contributed greenhouse gases. This holstein cow is one of many huge contributors to our methane production. Let students...

Algebra Number Sense Grades 5–HS
My teacher says this stream is parabolic.  Is he correct?
My teacher says this stream is parabolic. Is he correct?

Instead of asking students to just believe what you've said, why not ask them to verify your assertions? Students plot the points of the stream, perhaps map them...

Algebra Number Sense Grades 7–HS
Ladder figuring
Ladder figuring

Brian can't even go to his town's spring festival without seeing math. Let your class approximate the height or length of this ladder by using the relative size...

Algebra Number Sense Grades 5–HS
Lifespan of a meme, the Harlem Shake
Lifespan of a meme, the Harlem Shake

Five friends who skateboard and video tape made up a strange dance one afternoon and filmed it on February 2nd (look it up on youtube!). Now the whole...

Algebra Number Sense Grades 6–HS
Happy 14th B'ak'tun!
Happy 14th B'ak'tun!

Luckily, we’ve passed 12/21/2012 and the world is still here and we’ve made it into the start of the next Mayan calendar cycle ... the next B’ak’tun. The...

Number Sense Math and Science Grades 3–HS
Twinkies
Twinkies

Brian loves Twinkies and the news that Hostess is going out of business has upset him terribly. He needs his Twinkies. Twinkies last forever. Right? He's going to...

Number Sense Geometry Grades 4–6