| Festkern | Nominativ, Singular | nominative case, singular | |
| Festkern(e)s | Genitiv, Singular | genitive case, singular | |
| Festkern(e) | Dativ, Singular | dative case, singular | |
| Festkern | Akkusativ, Singular | accusative case, singular | |
| Festkerne | Nominativ, Plural | nominative case, plural | |
| Festkerne | Genitiv, Plural | genitive case, plural | |
| Festkernen | Dativ, Plural | dative case, plural | |
| Festkerne | Akkusativ, Plural | accusative case, plural |