In this example, Excel rounds the original value up to the next 15-minute increment. You can also replace "CEILING" with "FLOOR" in this formula to round the minutes down to the nearest 15-minute ...

Start Excel and open the worksheet containing the number you want to round up. Click inside of the cell where you want to display the calculation. Type "=ROUNDUP ()" into the formula bar. Click ...

Excel has rounded off the 12 and 13 digit numbers. The formula bar shows the actual value but the cell shows the rounded value. Fixing this problem is easy.