accent marks in numbers

Question

when I look up 6 I get seis no accent marks when i look up 16 I get deciseis with an accent over the e on seis

Is this correct?

Is there an accent over the e all the time or just some times

please do not double post. you have the correct answer in the other thread - mediterrunio, Nov 22, 2010

Answer 1

Seis es aguda pero también monosílabo (de una sola sílaba ya que -ei- es diptongo)

Los monosílabos no se acentúan, excepto los monosílabos que tengan dos posibles significados, por ejemplo: TE voy a dar algo... tomate un TÉ.

Dieciséis no es monosílabo y cumple por tanto las reglas generales de la acentuación, aguda y terminada en -s

Answer 2

Seis is sharp but monosyllabic too (of one syllable because -ei- is a diphthong)

Monosyllabic are not accent, except monosyllables which have two possible meanings, for example: TE voy a dar algo... tomate un TÉ.

Dieciséis is not monosyllabic and therefore complies with the general rules of accentuation, sharp ending in -s