Adding Percentages Using Excel. Microsoft Excel allows you to quickly add percentages to a series of numbers without performing each calculation by hand.

In this guide, I'll show you how you can use it to solve real-world problems. To follow along as you read this guide, download a free copy of the Excel workbook used in the examples.

Microsoft has identified an odd bug in Excel 2007 that incorrectly displays 100,000 as the multiplication result in a cell when the answer should be 65,535 or 65,536.

In Excel spreadsheets, complex formulas are difficult to enter without making mistakes. Microsoft Excel’s LAMBDA() function can make such errors easier to find.