*all*Mondays:

- 4/4
- 6/6
- 8/8
- 10/10
- 12/12

Think "I work 9 to 5 at the 7-11" and you'll remember these Mondays:

- 9/5
- 7/11

...and their opposites:

- 5/9
- 11/7

There's Pi Day (or Einstein's birthday, if you prefer), the Fourth of July, Halloween, and the day after Christmas:

- 3/14
- 7/4
- 10/31
- 12/26

So if someone asks, "What day of the week is September 20," you think, "I know the 5th is a Monday, so the 12th and the 19th are Mondays... Tuesday."

Of course you'll need a nice pi shirt for Pi Day. Here's a cool one:

And here are a couple other math shirts from Woot. I got the counting sheep. Number 3 is pooping.

[...] Doomsday Algorithm. Not related to pi but fun to teach on Pi Day. [...]

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