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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
Big gulp
Big gulp

Do you or your students love sugary drinks? What if it were against the law to order a large sugary drink where you lived? On September 13th, 2012...

Algebra Number Sense Grades 5–7
Cicada swarmaggedon
Cicada swarmaggedon

Most of the life cycle of the Magicicada Septendecim is spent underground. Then at 17 year intervals, these cicadas emerge from the ground, climb deciduous trees, molt into...

Algebra Number Sense Grades 3–6
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
Cruising
Cruising

There have been a lot of cruise ship mishaps and disasters this year. While these are in the news, let your students consider how these floating cities manage...

Algebra Number Sense Grades 4–7
Voyager on the edge
Voyager on the edge

The two Voyager space probes are in the news recently as they approach the edge of our solar system. Scientist can tell that the Voyager's environments are changing....

Algebra Number Sense Grades 3–7
Is this possible?
Is this possible?

Brian Shoemaker, a Newton, MA mathematics teache r, saw this Dunkin Donuts Mazda traveling down the road. He wondered if that size coffee cup could really have coffee...

Algebra Number Sense Grades 6–HS
Curiosity landed on Mars
Curiosity landed on Mars

Keep your students up on what's happening in space while analyzing Curiosity the Mars Rover's speed, the speed of a radio transmission from Mars, and the deceleration involved...

Algebra Number Sense Grades 4–7
What time is it in Cambodia?
What time is it in Cambodia?

I need help! My daughter is traveling in Cambodia and we are supposed to Skype just before her dinner time in Phnom Penh, Cambodia. What time is that...

Algebra Number Sense Grades 4–7
Storm cleanup
Storm cleanup

This activity could be used as an introduction to trig ratios. Students figure out the approximate length of the huge branch that I have to fell for safety...

Algebra Number Sense Grades 6–HS
Video game download
Video game download

How long will it take me to download the video game? This can be done as a 3 Act Task. To get started simply show the video and...

Algebra Number Sense Grades 4–HS
It sure is cold out ... or is it?
It sure is cold out ... or is it?

Students ponder the relationship between place latitudes and average January temperatures while they try to discover a correlation. Is this a linear or near linear relationship? … averaging,...

Algebra Number Sense Grades 5–HS