**David Cox** comes up with a sharp way to simulate the locker problem.

**Geoff Krall** turns a snow day (still cleaning out the backlog here!) into an estimation task for students and Facebook friends alike:

Want an easy way to build buy in? Have kids make predictions on something and make sure it

takes a long timefor them to see if they’re right. Like I said, our delay was a couple hours and this pretty much took up the entire time.

**Nat Highstein** cross-pollinates disease with probability and shares the lesson plan:

And one has … the dreaded Disease Z.

Students must identify who has The Dreaded Disease Z, as it is highly contagious – and fatal! If the infected person boards the ship with everyone else, they are all doomed.

The only way to identify each person’s health is through blood testing; a bag for each person has representative chips for their blood levels (per chart included below). I used color tiles in brown paper bags for this, and let students take 40 “blood samples.” With 40 chances, students had to be strategic about which bags to sample from.

**Marshall Thompson** uses math to corral his toddler.

What if I cut it into two 2 ft x 8 ft pieces and zip-tied them together? I’ll bend them into a circle with a 16 foot circumference. How much bigger or smaller than the play yard would it be? Would I need another sheet to make it big enough?

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## 1 Comment

## wwndtd

September 1, 2013 - 1:06 pmYay for more visuals…

How about this problem? http://wordplay.blogs.nytimes.com/2013/08/19/cake/?src=rechp&_r=0