MS Excel
Rounding errors can occur

Because excel uses hidden decimal places in computation
When you use addition and subtraction in a formula
When you use multiplication, division, or exponentiation in a formula
When you show the results of formulas with different decimal places that the calculated results

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MS Excel
To view a cell comment

Click the comment command on the view menu
Click the edit comment command on the insert menu
Position the mouse pointer over the cell
Click the display comment command on the window menu

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MS Excel
Right clicking something in Excel:

Nothing the right mouse button is there for left handed people
Selects the object
Deletes the object
Opens a shortcut menu listing everything you can do to the object

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