Translations:Expression Manager - presentation/230/en
From LimeSurvey Manual
When you want to compare value with relative or equality comparisons, pay attention at mismatches. A value entered by user (or provided via answer code) can be used as number if it is clearly a number.
If you surround one of the values with ", a text/string comparison will take place. If you want to compare as number, never surround a number with ".