MS Excel
To save a workbook, you:

Click the save button on the standard toolbar from the menu
Click Save on the Windows Start button
Select Edit > Save
Press Ctrl+ F5

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MS Excel
When a row of data is to be converted into columns

Copy the cells then go to Cells then on Alignment tab click Transpose check box and click OK
Copy the cells in column then choose Paste Special, then click Transpose and OK
Select the cells then place the cell pointer on new cell and choose Paste Special, mark Transpose check box and click OK
Copy the cells in row, select the same number of cells in row and paste

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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 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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