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Sweetheart candies
Sweetheart candies

NECCO went bankrupt in 2018 and Sweetheart candies weren't the same after that. They are back now and made better (?) in Ohio instead of Boston. How many...

Number Sense Math and Food Grades 5–7
Throwing Up
Throwing Up

This year, Buffalo, New York, has had more than 100 inches of snow this winter. We imagine that the height of the tunnel to people's homes is getting...

Algebra Geometry Grades 6–7
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
How many feet of lights should I buy for my tree?
How many feet of lights should I buy for my tree?

Check out our Christmas Tree! We need to buy lights for the tree. Without calculating, guess how many feet of lights we will need. What information would help...

Algebra Number Sense Grades 5–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
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
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
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
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