How has the pace of human innovation changed over time? Students order and subtract integers to explore major milestones in human history and debate whether humans are innovating faster than we can keep up with the consequences.
How have temperatures changed around the world? Students compare current temperatures to historical averages, and add and subtract positive and negative numbers to explore how the climate has changed in various cities over time.
How much is money worth? Students apply operations on rational and decimal numbers to calculate how much the U.S. Mint spends on different coins, and discuss whether we really need all these coins.