MS Excel
Rounding errors can occur

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

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MS Excel
How do you delete a column?

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

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