New to Excel? Looking for a tip? How about a tip so mind-blowingly useful as to qualify as a magic trick? You're in luck. In this Excel tutorial from ExcelIsFun, the 194th installment in their series of digital spreadsheet magic tricks, you'll learn how to use the SUM, VLOOKUP and ROUND functions to create a gradebook based on percentage scores that will calculate grade for you automatically. See also how the VLOOKUP and the percentage format can deliver the wrong grade when you dont use the ROUND function.