Decades are probably best referred to in the following manner: los (años)
sesenta‘the sixties’.
Basic arithmetical calculations
The verb seris used in the plural to mean ‘equals’:
Cinco y/más seis son once. 5 + 6 = 11.
Veinte menos trece son siete. 20 – 13 = 7.
Diez (multiplicado) por cuatro son cuarenta. 10 ×4 = 40.
Cien dividido por veinte son cinco. 100 ÷ 20 = 5.
Note: The division symbol in Spanish is :.
Ordinal numbers
primer(o)/a 1 o/1a 1st
segundo/a 2 o/2a 2nd
tercer(o)/a 3 o/3a 3rd
cuarto/a 4 o/4a 4th
quinto/a 5 o/5a 5th
sexto/a 6 o/6a 6th
sé(p)timo/a 7 o/7a 7th
octavo/a 8 o/8a 8th
noveno/a 9 o/9a 9th
décimo/a 10 o/10a 10th
undécimo/a 11 o/11a 11th
duodécimo/a 12 o/12a 12th
décimo tercer(o)/a 13o/13a 13th
vigésimo/a 20 o/20a 20th
23.2
23.1.5.3
1111
2 3 4 5 6 7 8 9
1011
1
12111
3 4 5 6 7 8 9
20111
1 2 3 4 5 6 7 8 9
30111
1 2 3 4 5 6 7 8 9
40
41111
23
Numerals and
numerical
expressions
244
Word order in dates
Word order in Spanish is fixed as above and does not allow the
English alternatives, 28th March or March 28th.