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Earth's perihelion with the Sun
Earth's perihelion with the Sun

On January 4th, 2023, Earth will be as close as it gets to the Sun during its orbit. Shouldn't that make this the warmest time of the year?...

Algebra Math and Science Grades 4–HS
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
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
Whole lot of cookies
Whole lot of cookies

This activity has been updated -- See the updated activity HERE

Algebra Number Sense Grades 2–4
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
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
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
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
Hexadecimal coloring
Hexadecimal coloring

Probably most of us have heard of and even used hexadecimal color codes. Don't you wonder why their number descriptions really make sense? In this activity we first...

Number Sense Geometry Grades 4–HS
Where should I drop my puck
Where should I drop my puck

Act 1 - Give students time to view the game board above or give them our one-page activity. The above picture is larger when you click on it....

Algebra Number Sense Grades 5–HS