Contributed by Walt Arrison

Most of us are familiar with the conversion formula that converts Celsius temperatures to Fahrenheit. Since many of us have difficulty doing fractions in our heads, an "alternate" method is taught to American travelers in Europe: - Double the Celsius temperature.
- Subtract 10% of that value.
- Add 32.
Most of us can do these computations in our head!
Why does this work? This would be a good exercise for an Algebra I class to do when they are studying combining like terms. |

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