Formula in Excel 2010
How to count cells by criteria
Use COUNTIF if you need to sum values for a particular person or other criterion.
How to sum cells by criteria
Use SUMIF if you need to sum values for a particular person or other criterion.
Hide formulas from appearing in the edit bar
Usually you can view a formula in the Excel cell when cell is selected, but you can protect spreadsheet to hide formulas in some cells.
Calculating the difference between two time stamps
Because time stamps are represented as serial numbers, you can subtract the earlier time from the later time to get the difference.
Solver tool allows you to specify multiple adjustable cells and constraints on the values that the adjustable cells can have, generate a solution that maximizes or minimizes a particular worksheet cell, generate multiple solutions to a problem.
Goal seeking is a useful feature that works in conjunction with your formulas. If you know what a formula result should be, Excel can tell you which values of one or more input cells you need to produce that result.
How to generate series of dates
Often you'll want to insert a series of dates into a worksheet. The most efficient way to enter a series of dates doesn't require any formulas - just use Excel's AutoFill feature.
Calculating the number of work days between two dates
When calculating the difference between two dates, you may want to exclude weekends and holidays.
Calculating the number of days between two dates
A common type of date calculation determines the number of days between two dates.
How to insert functions into formulas
The easiest way to enter a function into a formula is to use the Excel program's Insert Function dialog box.