# Constant Sum

Constant sum is a method that will allow us to setup and group multiple constant sum fields together to ask the respondent to enter a values that will match the total value you have specified.

![](https://1025048312-files.gitbook.io/~/files/v0/b/gitbook-legacy-files/o/assets%2F-M8fLhS0bmfBRyq0HdUm%2F-MBiuXJI5Q6g8qcN0dNC%2F-MBizc8gDuUQ80IUvAyg%2Fimage.png?alt=media\&token=34483e62-a903-4102-bdd4-56347a428113)

The respondent will need to answer each field with a number and the total of all fields must reach 100.

You may change the total sum to reach from the [question properties](https://docs.ngsurvey.com/form-management/form-designer/questions/question-properties) page.

![](https://1025048312-files.gitbook.io/~/files/v0/b/gitbook-legacy-files/o/assets%2F-M8fLhS0bmfBRyq0HdUm%2F-MBiuXJI5Q6g8qcN0dNC%2F-MBj-2BLxexNFz6LJogM%2Fimage.png?alt=media\&token=7e4b35ef-cda8-4c3c-a542-573781efb5f8)