What’s your guess? How fast are the number of daylight hours changing each day? Will the changes be dramatic or subtle? Students make guesses; compute how long, on average, the change in daylight hours should be; play with a cool…

Tuesday evening, December 12th, is the first night of Hanukkah this year. I think it was much later in December last year. Why isn’t it always on the same date? Students look at the Hebrew calendar and appreciate the incredible mathematics…

We have two classic puzzles for your April 1st class starters. PerplexingOne.pdf PerplexingTwo.pdf CCSS: MP.1, MP3,4.OA, 5.G, 8.EE, 8.SP For members we have solutions. PerplexingOne-solution.pdf PerplexingTwo-solution.pdf Or you might baffle and amaze your students with our Ghost Whisperer lesson.…

Thursday, September 22nd of this year will be the Autumnal Equinox. It is the time of year when the imaginary plane that might pass through the Earth’s Equator would also travel through the center of the Sun. At this auspicious…

Whether you or one of your siblings is going off to college next fall, it is useful to know how much colleges cost. Not going to college this fall? No worries, we can use the information on college costs in…

We hear nightly about who won delegates in state elections. But different states have different numbers of delegates. How is that figured out? Is it fair? The activity: Delegates.pdf Here’s a calendar of the nomination process: ElectionCalendar.pdf

In order to cook Paella (a delicious Spanish rice dish) I needed to buy Saffron spice. It was hugely expensive. So, I’ve decided to start a business of growing saffron and becoming immensely wealthy.

World Cup ranking – Students explore the ranking formulated from each team’s previous 4 years of play in their geographical divisions. The formula is complex and weighted. Is it fair? 5.OA, 5.NBT, 5.NF.B, 6.NS.B, 6.EE, 6.SP, 7.EE, 8.F, 8.SP, HSA World…

In December the soccer teams with the strongest world rankings were chosen to play in the once-every-4-years World Cup. The team rankings are calculated in a pretty complex manner. How are the 32 teams selected? Students can explore the ranking…

My friend from Boston created this list of cities that had won championships (in the last 10 years) in the four major national leagues. What does this list make you wonder? Which city has the best teams? How do you…

Here are some pictures from a recent snowfall at my house. How Much Snow Did I Get? Have students make an estimate. Ask them for a guess that is probably a little too low and one that is probably too…

In the board game, Monopoly, does a property’s distance from GO correlate to its rent when you land on it ? Using Brian’s spread sheet (list of properties, distance from GO, rent and rent with properties) students create scatter plots.…

We’ve used a graphic to help students understand what is meant by the Fiscal Cliff. Students will understand some of the terms and study the consequences of two upcoming scenarios. They will be deducing information from the graphic.

What is an IPO? Are they always good investments? Students analyze charts and data, learn a little about investing, calculate percent loss (unfortunately), and make some Facebook stock projections. facebook-IPO.pdf