Do not let what you cannot do interfere with what you can do.
—John Wooden
Do well and right, and let the world sink.
—George Herbert (Welsh poet)
Did you ever add a column of figures and the total did not agree with someone else’s total? Accountants have a quick test for such an accounting error. Subtract one column total from the other column total. If the difference between them is evenly divisible by nine, then two digits were probably reversed (129 instead of 192) or a zero is left off the end of one of the numbers.
Little tricks like this can easily catch simple mistakes before ...
