Recent Earthquakes

IRIS.eduSeismicMonitorNorthern Chili and Los Angeles, California have experienced recent earthquakes.  These quakes are along the “Ring of Fire” where Earth underground plates often collide.

The IRIS (Incorporated Research Institute of Seismology) Seismic Monitor will allow your class to visualize the most recent quakes and their magnitudes in this region.

Our updated Richter scale activity will allow your students to get an appreciation of the logarithmic Richter magnitudes.  

Department and school memberships


Is your math department looking for ways to use remaining math budget money?  Don’t let that math department money just disappear; put it to great use with memberships to Yummymath.

We have reduced membership rates for groups of teachers, departments and districts.   With membership, you will not only get continued use of our tasks, you will have access to editable word docs, Excel files, full solution materials and even teaching suggestions.  Your support will help us to remain advertisement free and keep our membership rates extremely low (a little more than $1 a month).

Pizza party


In this activity students decide how to divide 2 pizzas amongst 6 adults and 3 pizzas amongst 8 kids.  Fractional pizza parts need to be drawn and considerations discussed about which fractions are greater. Students interpret a fraction as division of the numerator by the denominator (a/b = a ÷ b).  Wicked fun, warm, and tasty.

April Fool’s day perplexors

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.  They will think you are pulling one over on them until they figure out the math!

Another great April Fool’s day activity would be Robert Kaplinsky’s Foil Prank.

Greatest March Madness Program



Based on this data, which do you think is the greatest March Madness program ever?

Once students decide their “best program ever” challenge them use a different criteria than they originally used. That is, ask them to think of another way to determine the best program ever.  There are lots of ways to think about it.  No one way is the only way or the correct way.  The point is to get students reasoning and communicating mathematically.

Cell phone plans


Its time to go get the latest iPhone, the 5s.  Which of the above plans will you choose?  Should you sign a 2-year contract on one of the above plans to get the iPhone for $200?  Or should you go through T-Mobile, pay $648 for the phone and $60 a month for 3 GB of data?

This lesson makes a great intro to linear relationships.  Student pick one plan and consider the cost of the phone and plan over time.  They make tables, graphs and equations.  Consider allowing students to begin playing with the task without much initial direct instruction.  Guide them with good questioning and teach after they have had time to grapple with these questions and construct new ideas.