Egad, Hanukkah begins this year on Sunday evening, November 28th. I think it was in December last year. Why isn’t it always on the same date? Students look at the Hebrew calendar and appreciate the incredible mathematics involved in creating a…

What was the going tooth rate in your house? Do you think that, on average, you were paid well or were you disappointed? Was your first tooth lost especially remunerative? Look at historical averages and check out how you did.

Introduce Roman numerals to your class. In this activity students learn the rules for evaluating Roman numerals, decipher copyright dates, see how Roman numerals are used today, and do some strange looking arithmetic and surprisingly easy computation.

Brian has a lot of puzzles. His family must love working on them. What do you wonder about his puzzles? What do you notice? Make an educated guess, about how many pieces are in all of these puzzles? Can you…

Students learn how the Postal Service is funded and try to decide how the USPS could earn more or spend less in their operation. They finally get to think about whether the post office should be a government run service or a self-sustaining business.

In 2018, the trailer of a truck filled with Ramen noodles was stolen from a parking lot in Georgia. The trailer contents were valued at $98,000. What do you wonder about this? Is this even possible?

Could $98,000 worth of Ramen even fit in a tractor trailer?

How big is a coronavirus cell? How big is a micron? How well do these masks protect against the virus? What can you observe about the size of particles mentioned? Why are we wearing masks?

The Iditarod Dog Sled Race will begin this year on Saturday, March 7th in Anchorage, Alaska. It is often called The Last Great Race on Earth because it is so long and grueling. Students do some rate, distance, and hardship comparisons to decide…

This year we will add the 29th of February to our year? Why do we do that? How can you tell? What if we didn’t add a day every 4 years? Calendar math and flow charts.

Worldwide Nike supports many teams and athletes. They design, manufacture, and supply gear for almost every sport imaginable. How much are those give-aways worth? Is the company going to go broke? Probably not. Nike is huge. In this activity we…

In December soccer teams with the strongest world rankings were chosen to play in the once-every-4-years World Cup. The World Cup competition has just begun and will continue through July 15th. The team rankings are calculated in a pretty complex…

This activity is the first in our series on mental math tricks. Let your students develop their own individual way of mentally multiplying by 0.5, 5, 50, 500, and so on. We have a little practice and a requirement for…

We’ve found that some students believe that the approximation that their calculators show for irrational numbers is exact. Here’s an activity that you can advertise as long multiplication review. After they study our calculations have a discussion just to clarify…