MS Excel
Rounding errors can occur

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

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MS Excel
You can select a single range of cells by

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
Dragging over the desired cells
Pressing the Shift key and an arrow key

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MS Excel
How do you delete a column?

Select the column heading you want to delete and select Insert Delete from the menu
Right click the column heading you want to delete and select delete from the shortcut menu
Select the row heading you want to delete and select Edit>Delete from the menu
Select the column heading you want to delete and select the Delete Row button on the standard toolbar

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