[Photo by Dominic.]
The carnival is up and running, with plenty of math fun for all ages:
Welcome to this installment of Math Teachers at Play! Three: It’s a Magic Number! …
Go check it out!
Blog
Real-Life Story Problem
More Fun with Pi
Key Lime Pi
This may be my favoritest ever Pi Day T-shirt, designed by the admin over at 10-Minute Math. I admit it’s not very mathy, but I’ve always enjoyed word play, and I love key lime.
The design won a Reflection T-shirt Company contest and is now available to pre-order for only $8.99 (plus shipping). [Company seems to have gone out of business? Can’t find their website…]
Unfortunately, it won’t be available in time for this Friday’s class.
Math Teachers at Play #2
[Photo by Sister72.]
Welcome to the second Math Teachers At Play blog carnival! Some articles were submitted by their authors, other were drawn from the back-log in my blog reader, and I’ve spiced it all up with a few of my favorite quotations.
Let the mathematical fun begin…
How Much is a Trillion?
[Photo by reubenaingber.]
If you collected stacks of $100 bills, could you fit a trillion dollars into your bedroom?
In your house?
In a warehouse?
If you spent a dollar a second, how long would it take to spend a trillion dollars?
[HT: Justin Taylor at Between Two Worlds.]
Happy Square Root Day!
[Photo by arsheffield.]
Check it out:
- Celebrating Square Root Day
- Have a rootin’ tootin’ Square Root Day
- Prime, Composite, and Square Numbers activity
- Free, printable Square Roots Worksheets
- About the Pythagorean Theorem
- Pythagorean Puzzle — a lesson plan prototype
- 81 proofs of the Pythagorean Theorem
And coming soon: Pi Day.
Edited to add: Jonathan‘s class enjoyed extending the concept to include other products. Using the m/d/yy format (not the 4-digit year), how many times in your life has it been true that 
Quotations XXIII: The Poetry of Logical Ideas
[Photo by pshutterbug.]
It’s been ages since I posted any blackboard quotes, so here are a few gems from last semester. [Hat tip: I found most of the quotes in this list at The Quote Garden’s Quotations about Math page.]
Pure mathematics is, in its way, the poetry of logical ideas.
Continue reading Quotations XXIII: The Poetry of Logical Ideas
Math Warm-Up: Today Is February 4×3×2×1
[Feature photo above by Tom@HK.]
One of my favorite warm-up exercises for Math Club is “Today is ______.” Each student invents one or more mathematical expressions for today’s date and writes his or her favorite on the board for all to admire. Answers range from lazy (24×1 — at least it’s an excuse to talk about identity elements) to unnecessarily repetitive (1+1+1+…), but we usually get a few gems as well.
Math Teachers at Play #1
[Photo by StuSeeger.]
Welcome to the inaugural edition of the Math Teachers At Play blog carnival! I hope you enjoy this collection of tips, tidbits, games, and activities for students and teachers of preschool-12th grade mathematics.
For this first carnival, I’ve drawn several recent posts from my blog reader as examples of the types of posts I’d love to include in future editions of Math Teachers at Play. I tried to find something for everyone, from multiplication drill for elementary students to advice for understanding high school math equations.
Let the mathematical fun begin…
Denise Gaskins' Let's Play Math 