..In longitudinem milia passuum..

[puer brasilianus]

Qui um longitudinem milia passuum CCXL patebant, in latitudinem milia passuum CLXXX patebant..

My question is about what declension the number is.. CCLX

In ducenti quadraginta
In ducentos quadraginta
In ducento quadraginta

Ut solet, gratias vobis ago..

 

[Pacifica]

The numbers refer to milia, so they must agree with it.

I'm not sure why you're putting in before the number. The two ins in the Latin only go with longitudinem and latitudinem.

 

[puer brasilianus]

Ok, but what about with the context?
In longitudinem milia passuum CCLX patebant.. (Ducenti quadraginta) or (ducentos quadraginta patebant? Accusative or nominative? What I mean is accusative of extent of space or simply the nominative form..

 

[Pacifica]

(Ducenti quadraginta) or (ducentos quadraginta

Neither. The numbers modify milia, which is neuter plural. Therefore they, too, must be neuter plural.

Accusative or nominative? What I mean is accusative of extent of space or simply the nominative form..

Accusative of extent of space.

 

[puer brasilianus]

Ducenta quadraginta?

 

[Pacifica]

Yes.