A combination of 10 Heavenly Stems and 12 Earthly Branches, the year’s symbol creates a sequence of year names that eventually repeat. Students explore the least common multiple of these two cycles without ever hearing the term LCM.

Today, Wednesday, 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? In this activity students become familiar with the terms perihelion and aphelion as they calculate…

In 1980, a gallon of gas costs $1.22. Today’s prices are a lot higher. Is that because the price has gone up or because in 1980 you could buy a lot more with $1.22 than you can buy today?

Students analyze the ratios and percents of population, participation, and money spent in honor of October 31st. This activity takes kids through finding parts of wholes as well as ratio, percents and proportion problems.

Students learn about the initial weight of the giant meat patty and calculate the final weight of the patty after it is cooked. They decide what percent lean this meat must have been and consider how long it would take their family to eat the entire world-record burger.

How much did it cost to make? How much will it gross? Is the Spider-Man phenomena a guarantee for success? How would you compare all of the Spider-Man movies?

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.

Students consider the posted pricing of this bowling alley. What must they consider when choosing how to pay? What do you expect will be the best deal? How do you know?

In this activity students try to figure out how time settings will change as they move from place to place and what variables are involved in the daylight savings time shift. Day length? Latitude?