Students study charts that show variations from normal sea surface temperatures during El Niño years. They get the chance to more fully understand these events and understand the world-wide ramifications of an El Niño year.

In this 3-act activity, students need to invent a different way to measure the powdered chocolate than what the instructions dictate. How many 1/4th teaspoonsfuls of powder = 2 teaspoons? How many 1/8th teaspoons = 2 teaspoons? General rule?

Dyeing eggs with food coloring – Students use the chart on the back of a food dye package to compare the strangely different recipes listed for coloring a cake, icing, or dyeing eggs. They look for and create equivalent ratios…

Jennifer Fairbanks from Hopkinton, MA sent us this picture of the cookies that she baked in 4 hours using 13 eggs and 5 cups of sugar. Do you see some math here?

Fraction operations might be more interesting when it involves chocolate. Students reason and calculate what is left of these chocolate bars. The bars are the same size but are molded into different number of sections. Yum!

Click here to see the Population Clock bigger in a new window. How in the world does this clock conclude that there is a net gain in the United States of one person every 14 seconds?

Clicking on this map of the Mayan territories will open it larger and in a new window Luckily, we’ve passed 12/21/2012 and the world is still here and we’ve made it into the start of the next Mayan calendar cycle…