How to convert Celsius to Fahrenheit; don't

Since we're on a weather bent, I thought I would pass on this gem of weather-related trivia.
In Canada, we measure temperatures in Celsius, much to the confusion of our American friends and guests.
We often hear them at camp trying to remember the formula on how to make the conversion to Fahrenheit as they look at the day's weather forecast.
(To convert Celsius to Fahrenheit, you multiply the temperature in Celsius by 9/5 and add 32.)
Who are you, Einstein?
Can you multiply a number by 9/5 in your head?
If you can then why are you wasting your time thinking about the weather? You should be a mathematician or a statistician or even a bookie.
I overheard one of our guests point out one time that it's meaningless to go through complex calculations just to precisely estimate the temperature.
This little poem tells you all you need to know about Celsius, he said.
Zero's freezing.
Ten is not.
20's warm.
30's hot.
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