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This activity has been updated (2026). See the new activity here: https://www.yummymath.com/post/light-bulb-cost-comparison/ There's a lot of misinformation out there about the cost to consumers of CFL and LED...
April 22nd is Earth Day. Use this activity to demonstrate the various mappings of our 3-d Earth to a 2-d piece of paper. Students compare maps with this...
Passover is one of the three high holidays in the Jewish calendar and celebrates the Exodus of Jews from slavery in Egypt. Let your students review fractions in...
During the St. Patrick's Day parade in Chicago, the local plumbers union dyes the Chicago River emerald green. Students learn what PPM (parts per million) means and attempt...
For Saint Patrick's Day add a little nutrition math to your celebration. In this post we look at calories, carbohydrates, sugars, fats, and proteins to decide what would...
Tom Lehrer is a singer, songwriter, satirist, pianist and mathematician who has written some wonderful songs. In 1959 he wrote a song called “New Math”. At that time,...
Updated! Carbon dioxide and methane are our two most prevalent human-contributed greenhouse gases. This holstein cow is one of many huge contributors to our methane production. Let students...
Father's Day is coming up, and there is still time to have a tiny fraction review in the guise of celebrating Father's Day. This is a short activity...
Do you or your students love sugary drinks? What if it were against the law to order a large sugary drink where you lived? On September 13th, 2012...
Five friends who skateboard and video tape made up a strange dance one afternoon and filmed it on February 2nd (look it up on youtube!). Now the whole...
There have been a lot of cruise ship mishaps and disasters this year. While these are in the news, let your students consider how these floating cities manage...
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 ... the next B’ak’tun. The...