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At least the days are getting longer
At least the days are getting longer

What's your guess? How fast are the number of daylight hours changing each day? Are the changes dramatic or subtle? Students make guesses; compute how long, on average,...

Algebra Number Sense Grades 4–7
How should I spend my rewards?
How should I spend my rewards?

There's a new way to earn rewards at many grocery stores. For every dollar that you spend, you accumulate points. Then there are special rewards where you earn...

Algebra Number Sense Grades 4–7
December 21, 2020 - Great conjunction
December 21, 2020 - Great conjunction

Right now, just after sunset, in the southwest sky, you can check out the planets of Jupiter and Saturn as they get closer and closer to each other....

Algebra Number Sense Grades 3–HS
Candy deals
Candy deals

We found big mixed bags of candy at really good prices ... we think. Students are asked to decide which would be the best deal and the worst...

Number Sense Math and Food Grades 4–6
Monster cake
Monster cake

Jodie Berman, a high school math teacher in Chicago, loves mathematics and loves to cook. We've created an activity based on her Monster Cake (composed of everything that...

Number Sense Geometry Grades 3–6
How much chocolate is left?
How much chocolate is left?

In this short activity, students reason and calculate what is left of these chocolate bars. The bars are the same size but are molded into different numbers of...

Algebra Number Sense Grades 3–5
Extreme weather 2020
Extreme weather 2020

Because of climate change, we've been having too many extreme weather events. There have been unusual droughts and heat in the West, an increased number of hurricanes, severe...

Number Sense Math and Science Grades 4–7
Ramen noodle heist
Ramen noodle heist

In 2018, a truck trailer was stolen from a parking lot in Georgia. The trailer was filled with Ramen noodle packages and its contents were valued at $98,000....

Number Sense Geometry Grades 3–6
How big is this hornet really?
How big is this hornet really?

Egad !!!! Giant Asian hornets have now migrated to Washington state and British Columbia. Even though they are sometimes called "murder hornets" their stings aren't fatal. Their stings...

Number Sense Geometry Grades 3–6
It might be a good year to see the Perseid meteor shower
It might be a good year to see the Perseid meteor shower

Catching a productive meteor shower can be a stunning experience. On the evenings and mornings of August 11 th , 12 th and 13 th there could be...

Math and Science Holidays and Annual Events Grades 4–HS
How much water should you be drinking?
How much water should you be drinking?

As we are outdoors more and temperatures are rising, it might be a good time to look at hydration. A healthy requirement for fluids can't really be the...

Algebra Science Grades 4–HS
Really stuffed!
Really stuffed!

Wow, these cookies look really stuffed! How much more "stuffed" are they compared to Triple Double Oreos, Double Stuf Oreos or even Original Oreos. Does this look yummy...

Algebra Number Sense Grades 4–HS