Numbers

Question 1

Cardinal numbers?

Answer 1

uno changes to un before a masculine noun
Cien refers to 100 but for 100+ use ciento followed by another number
Beyond this adding cientos to the number : doscientos, trescientos
Exceptions: quinientos, setecientos, novecientos
Numbers ending in - cientos/as are adjectives and should agree with the noun they describe
trescientos ensayos, setecientas casas
The word y goes between the tens and units but not after the hundred words : doscientos y ocho
Before thousand and hundreds it’s not necessary to add a or one beforehand, cien, mil

Question 2

What are ordinal numbers?

Answer 2

adjectives and need to agree with the noun they describe
Es La primera casa a la izquierda; me encanta el segundo capítulo
Before a noun, primero and tercero lose the final o
Es el primer plato; es el tercer caso

Question 3

How to use time expressions?

Answer 3

Use es for any time related to one o’clock and son for any other times
Es La Una y media; son las tres menos veinte
To talk about something taking place at a certain time, use a:
Como a las dos; a las nueve y media empieza la película
For dates use cardinal Numbers; es el dos de febrero
Days and months don’t have capital letters martes 16 de agosto
when talking about something happening regularly on a day of the week use los:
Los sábados vamos al pueblo; los miércoles tengo mi clase de guitarra