f the values of a series is added by a common number, it is said to bechange in scale.modification.simplification.change in origin.

The correct answer to your question is "change in scale."

Explanation:

When the values of a series are added by a common number, the overall value of the series is shifted up or down uniformly. This type of modification affects the scale of the data, which is essentially how the data is represented without altering the relative distances between the points. In contrast, changes in origin imply a shift in the starting point of the series but not in the scale. Therefore, adding a common number to all values consistently creates a change in scale.

So, the answer you are looking for is change in scale.