My high school class ended the year with a review of multiplying and factoring simple polynomials. We played this matching game, and then I gave them a puzzle worksheet. I liked this idea, but I didn’t like the decoded answer. In my opinion, puzzles should give the student a “reward” for solving them — maybe a joke or riddle or something — but that answer seemed almost like nagging.
So I changed things around to make my own version:
My homeschool co-op classes had a lot of fun creating this April calendar to hand out at our end-of-semester party on Friday. It’s not as easy to read as a traditional calendar — it is more like a puzzle. The expression in each square simplifies to that day’s date, so families can treat each day like a mini-review quiz: “Do you remember how to calculate this?”
Download your own copy:
If you’ve been wanting to start your own math club, you will find plenty of helpful ideas here:
Check out my May Math Calendar post for more ideas about how to use these puzzles.
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“April Math Calendar” copyright © 2009 by Denise Gaskins.
[Graph created at Draw Function Graphs.]
Kate at f(t) took my popular Math War game to a new level by making a set of Logarithm War cards. Cool! Download a deck for yourself:
Logs and Trig War—Jim Pai extended Kate’s logarithm war to include trig functions. Double the cards, double the fun! Download from Jim’s blog: War: what is it good for?
[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.]
[Photo by arsheffield.]
Check it out:
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 
[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.
[Photo by angela7dreams.]
A forum friend posted about her daughter’s adventure in learning the math facts:
“She loves stories and drawing, so I came up with the Math Friends book. She made a little book, and we talked about different numbers that are buddies.”
[Photo by Amanda M Hatfield.]
Have you made a resolution to exercise your mental muscles this year? Then please join us for the 2009 Mathematics Game. Here are the rules:
Use the digits in the year 2009 and the operations +, -, x, ÷, sqrt (square root), ^ (raise to a power), and ! (factorial) — along with parentheses, brackets, or other grouping symbols — to write expressions for the counting numbers 1 through 100.
- All four digits must be used in each expression.
- Only the digits 2, 0, 0, 9 may be used.
- The decimal point may be used, as in .9, .02, etc.
- Multi-digit numbers such as 29 or 902 may be used, but preference is given to solutions that avoid them.
By definition: 
[See Dr. Math’s Why does 0 factorial equal 1?]
For this game we will accept: 
[See the Dr. Math FAQ 0 to the 0 power.]
[Photo by theogeo.]
Christmas afternoon is a slow time at our house. How shall we while away the hours until the turkey is done? With math, of course!
Check out this puzzle from Blinkdagger.
Denise Gaskins' Let's Play Math 