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Winter Solstice 2023
Winter Solstice 2023

It is really dark out now. Why is that? Students appreciate how their latitude effects the darkness of their late afternoon location as they study the earth's tilt...

Number Sense Geometry Grades 5–HS
Do I have enough wrapping paper?
Do I have enough wrapping paper?

In this problem based activity students first guess and then try to calculate whether they will have enough paper to wrap this present without taping pieces of wrapping...

Algebra Number Sense Grades 5–HS
Wind chill
Wind chill

The weather forecasters tell us what the wind chill temperature will feel like. How do they figure out that number? In this activity students use the National Weather...

Algebra Number Sense Grades 4–HS
Lots of Cranberries
Lots of Cranberries

 The harvest must be nearing completion now and growers are selling their product to make cranberry juice, jelly, sauce, and of course, fresh berries in time for...

Geometry Math and Food Grades 4–7
Total lunar eclipse
Total lunar eclipse

On the morning of November 8, 2022, many of us will be able to see the last full lunar eclipse until March 2025. Luckily, many of us will...

Geometry Math and Science Grades 3–HS
How big could this mid-term election be?
How big could this mid-term election be?

Will the November 8 th 2022 election bring record number of voters to the polls? Students get a chance to understand what the usual percentage of voters is,...

Number Sense Math and Social Studies Grades 4–7
I need help raking my leaves
I need help raking my leaves

Brian has spent too much time thinking about his leaves. He's worried about raking them alone and thinking about how long the job would take if people helped....

Algebra Number Sense Grades 4–HS
Inflation and the cost of gasoline
Inflation and the cost of gasoline

In 1980, one gallon of gasoline costs $1.22. Today's prices are a lot higher. Is that because the price has gone up or because in 1980 you could...

Algebra Number Sense Grades 4–6
Hurricanes, Typhoons, and Cyclones
Hurricanes, Typhoons, and Cyclones

Graphic from http://lagoon-inside.com [ This week Hurricane Fiona caused major damage to Puerto Rico, the Dominican Republic and the Caribbean, This is the season for increased cyclonic activity...

Algebra Number Sense Grades 6–HS
How much caffeine are you consuming?
How much caffeine are you consuming?

Did you know that there is an amount of caffeine that is too much for the growing brain of a teenager? We did some research and have asked...

Algebra Number Sense Grades 5–HS
How many gumballs are there?
How many gumballs are there?

Gumball Machine Problem from Brian Marks on Vimeo This problem is a little puzzle to get your students thinking, estimating, and calculating. We've given you a pdf file...

Number Sense Geometry Grades 5–HS
Willy Makeit or Betty Wont
Willy Makeit or Betty Wont

I have to go to the bathroom pretty badly. I have to admit that I have been holding it in for a while. Finally! I see a bathroom...

Number Sense Geometry Grades 3–5