In this case, the MOD function is used to perform a modulo operation, which returns the remainder after division. The formula used to validate input is: The value in C5 is 500. The MOD function divides 500 by 100 and gets 5, with a remainder of zero. Since 0 = 0, The rule returns TRUE and the data validation passes: If a user enters, say, 550, the remainder is 50, and validation fails: Note: Cell references in data validation formulas are relative to the upper left cell in the range selected when the validation rule is defined, in this case C5.

### Dave Bruns

Hi - I’m Dave Bruns, and I run Exceljet with my wife, Lisa. Our goal is to help you work faster in Excel. We create short videos, and clear examples of formulas, functions, pivot tables, conditional formatting, and charts.