MS Excel
How do you select an entire column?

Click the column heading letter
Hold down the shift key as you click anywhere in the column
Select Edit > Select > Column from the menu
Hold down the Ctrl key as you click anywhere in the column

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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 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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