Here is an article with some Excel tips!

http://www.computerworld.com/article/2907515/your-excel-formulas-cheat-sheet-15-tips-for-calculations-and-common-tasks.html?phint=newt%3Dcomputerworld_thisweek&phint=idg_eid%3De6a70c0a773b5dd93399e3283c15a855#tk.CTWNLE_nlt_thisweek_2015-04-13