Cardinal Numbers 31-1000

First, let's review the cardinal numbers 1-30:

1. uno
2. dos
3. tres
4. cuatro
5. cinco
6. seis
7. siete
8. ocho
9. nueve
10. diez
11. once
12. doce
13. trece
14. catorce
15. quince
16. dieciséis
17. diecisiete
18. dieciocho
19. diecinueve
20. veinte
21. veintiuno
22. veintidós
23. veintitrés
24. veinticuatro
25. veinticinco
26. veintiséis
27. veintisiete
28. veintiocho
29. veintinueve
30. treinta

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The next step is to learn to count by 10s all the way to 100:

10. diez
20. veinte
30. treinta
40. cuarenta
50. cincuenta
60. sesenta
70. setenta
80. ochenta
90. noventa
100. cien

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Now, see how easy it is to fill in the gaps:

31. treinta y uno
32. treinta y dos
33. treinta y tres
34. treinta y cuatro
35. treinta y cinco
36. treinta y seis
37. treinta y siete
38. treinta y ocho
39. treinta y nueve
40. cuarenta
41. cuarenta y uno
42. cuarenta y dos
etc.

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This pattern continues all the way to 100:

53. cincuenta y tres
54. cincuenta y cuatro
65. sesenta y cinco
66. sesenta y seis
78. setenta y ocho
88. ochenta y ocho
99. noventa y nueve
etc.

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From 101-199, use "ciento":

ciento uno
ciento dos
ciento tres
ciento sesenta y uno
ciento sesenta y dos
etc.

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Notice that "y" is used only in numbers 31-99 (and 131-199, 231-299, 331-399, etc.) and it is not used to separate hundreds from tens.

Correct:
ciento ochenta y nueve

Incorrect:
ciento y ochenta y nueve

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To get to 1000, all of the rules you have learned so far continue to apply. All you need to do now is learn to count by 100s all the way to 1000, and that is quite easy:

100. cien
200. doscientos
300. trescientos
400. cuatrocientos
500. quinientos
600. seiscientos
700. setecientos
800. ochocientos
900. novecientos
1000. mil

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Here are some more examples:

142. ciento cuarenta y dos
375. trescientos setenta y cinco
612. seiscientos doce
907. novecientos siete
999. novecientos noventa y nueve

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Remember from an earlier lesson, there is a masculine and a feminine form for the number one:

un libro
one book

una pluma
one pen

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This is also true for the numbers 200, 300, 400, etc.

doscientos libros
doscientas plumas

cuatrocientos señores
cuatrocientas señoras

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When there is exactly 100 of something, and the number is used with the noun, use the shortened form "cien."

cien dólares
cien gatas
cien perros
cien pesetas

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Finally, in Spanish a period is used to indicate thousands, and a comma is used as a decimal point.

English
1,543.67

Spanish
1.543,67

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