For those us (and we may be legion) who count on our fingers and can’t remember our 9 times whatever, here is a quick tip for doing math without pulling up the calculator on your Mac. If you are using Leopard you can do simple math using Spotlight.
Spotlight is found in the top right corner of your toolbar, next to your name. Click on the magnifying glass symbol to open Spotlight and start entering your numbers. Use + to signify addition, – for subtraction, * for multiplication, and / for division.
The answer to your math problem appears automatically. It couldn’t be simpler.