MS Excel
Rounding errors can occur

Because excel uses hidden decimal places in computation
When you use multiplication, division, or exponentiation in a formula
When you use addition and subtraction 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

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

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MS Excel
You can select a single range of cells by

Pressing the Shift key and an arrow key
Dragging over the desired cells
Clicking the upper-left cell in a group of cells and then pressing the Shift key while clicking the lower right cell in a group of cells
Pressing the Ctrl key while dragging over the desired cells

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