Save this for the spreadsheet jocks in your office—we'd bet even the experts don't know all of these formula tips.

Excel provides one general formula that finds the difference between numbers, dates and times. It also provides some advanced options to apply custom formats to your results.

You may want to multiply cells or numbers in Microsoft Excel to analyze data. Here's what you need to know to do it.

You can sum a series of numbers in Microsoft Excel manually by typing in a simple formula, or automatically with a tool.