I have an Excel sheet holding four columns, each containing a number between 1 and 10. The first two columns contain proper values, however, column three and four do not. Instead, they contain inverse values due to a mistake in data collection. I would like to invert the values once more in order to adjust for the mistake. An example would be a cell holding the value 7, which should be 3, as the limit is 10. In similar fashion, the number 3 should be inverted to 7 and so forth. How would I go about in order to achieve this result for a whole column?