Numbers Written In Spanish 1-100 | Say Them Right Every Time

Spanish numbers from 1 to 100 follow a small set of spelling patterns, so once you learn the builds, the rest come out fast and clean.

You can memorize a list, sure. Yet Spanish numbers feel a lot easier when you learn how they’re built. That’s the difference between “I know 17” and “I can write 67 without guessing.”

This page gives you both: the patterns that generate the whole set, plus a complete 1–100 list you can copy into notes, study, or use for homework, pricing, dates, and ages. You’ll see where accents show up, when words fuse into one, and what changes with gender.

Why spelling 1–100 gets tricky

Most learners trip on the same spots: the “teen” range, the 20s, and the “y” numbers (31, 42, 58, and so on). The good news is Spanish spelling is steady once you know which ranges write as one word and which ranges stay split.

Two habits help right away:

• Learn the “base blocks” (1–15, the tens, and 100).
• Learn the build rules for 16–19 and 21–29, plus the “tens + y + ones” shape from 31–99.

Writing Spanish numbers 1 to 100 with pattern rules

Spanish cardinal numbers (the counting numbers) mix three main build styles: a single word, a fused word, or a multi-word phrase with y. The official spelling guidance is clear on which sets fuse and which do not, including the one-word spellings in the 16–19 and 21–29 ranges. Ortografía de los numerales cardinales (RAE) lays out those patterns.

Base blocks you should lock in first

If you can write these without pausing, the rest gets lighter:

• 1–15: uno, dos, tres, cuatro, cinco, seis, siete, ocho, nueve, diez, once, doce, trece, catorce, quince
• Tens: veinte, treinta, cuarenta, cincuenta, sesenta, setenta, ochenta, noventa
• 100: cien (and ciento when it’s followed by more words, like “ciento uno”)

How 16–19 are formed

These fuse into one word. Think “diez + i + seis” and friends:

• 16: dieciséis (note the accent)
• 17: diecisiete
• 18: dieciocho
• 19: diecinueve

How 21–29 are formed

These also fuse into one word, built off veinte. The spelling shifts slightly because it’s a fused form, not “veinte y dos.” The RAE treats these as one-word numerals in modern spelling. RAE guidance on fused numerals covers this set directly.

A common pain point is 21, since it changes with gender in real sentences:

• 21 alone: veintiuno
• Before a masculine noun: veintiún libros
• Before a feminine noun: veintiuna páginas

If you want the official reference on that form, the Diccionario panhispánico de dudas entry for “veintiuno, veintiuna” explains its use and agreement.

How 30–99 are formed

From 31 onward, Spanish uses a steady pattern: tens + y + ones. No fusing. No hyphens. Just spacing.

• 31: treinta y uno
• 42: cuarenta y dos
• 58: cincuenta y ocho
• 99: noventa y nueve

Gender changes you’ll actually see

In everyday writing, only a couple of number parts change with gender: uno/una and the hundreds that end in -cientos/-cientas (doscientos/doscientas, and so on). This matters in ages, counts, and inventory lines. The RAE’s usage guidance spells out which numerals inflect for gender and how that plays out in compounds. Los numerales: los cardinales (RAE) is a solid reference.

Two quick examples you’ll meet a lot:

• Una mesa, treinta y una mesas
• Doscientas personas, doscientos libros

Range	How it’s written	What to watch for
1–15	Single words to memorize	These are the building blocks for most later forms.
16–19	One fused word (dieci + …)	16 takes an accent: dieciséis.
20	Single word: veinte	Don’t add y inside 21–29 in standard spelling.
21–29	One fused word (veinti + …)	22, 23, 26 take accents: veintidós, veintitrés, veintiséis.
30, 40, 50…90	Single words for each ten	Spellings are fixed: cuarenta (not “quarenta”), cincuenta, setenta.
31–99	Tens + y + ones	Keep spaces: sesenta y siete, not fused.
100	cien	Use ciento when followed by more: ciento uno.
Gender agreement cases	uno/una, -cientos/-cientas	21 before nouns: veintiún (masc.), veintiuna (fem.).

Numbers Written In Spanish 1-100 in a clean list

This is the full set in words. If you’re studying, try reading them aloud in chunks: 1–15, then 16–29, then tens, then the “tens + y + ones” runs. You’ll start to feel the rhythm.

1–29

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

30–59

30. 30: treinta
31. 31: treinta y uno
32. 32: treinta y dos
33. 33: treinta y tres
34. 34: treinta y cuatro
35. 35: treinta y cinco
36. 36: treinta y seis
37. 37: treinta y siete
38. 38: treinta y ocho
39. 39: treinta y nueve
40. 40: cuarenta
41. 41: cuarenta y uno
42. 42: cuarenta y dos
43. 43: cuarenta y tres
44. 44: cuarenta y cuatro
45. 45: cuarenta y cinco
46. 46: cuarenta y seis
47. 47: cuarenta y siete
48. 48: cuarenta y ocho
49. 49: cuarenta y nueve
50. 50: cincuenta
51. 51: cincuenta y uno
52. 52: cincuenta y dos
53. 53: cincuenta y tres
54. 54: cincuenta y cuatro
55. 55: cincuenta y cinco
56. 56: cincuenta y seis
57. 57: cincuenta y siete
58. 58: cincuenta y ocho
59. 59: cincuenta y nueve

60–79

60. 60: sesenta
61. 61: sesenta y uno
62. 62: sesenta y dos
63. 63: sesenta y tres
64. 64: sesenta y cuatro
65. 65: sesenta y cinco
66. 66: sesenta y seis
67. 67: sesenta y siete
68. 68: sesenta y ocho
69. 69: sesenta y nueve
70. 70: setenta
71. 71: setenta y uno
72. 72: setenta y dos
73. 73: setenta y tres
74. 74: setenta y cuatro
75. 75: setenta y cinco
76. 76: setenta y seis
77. 77: setenta y siete
78. 78: setenta y ocho
79. 79: setenta y nueve

80–100

80. 80: ochenta
81. 81: ochenta y uno
82. 82: ochenta y dos
83. 83: ochenta y tres
84. 84: ochenta y cuatro
85. 85: ochenta y cinco
86. 86: ochenta y seis
87. 87: ochenta y siete
88. 88: ochenta y ocho
89. 89: ochenta y nueve
90. 90: noventa
91. 91: noventa y uno
92. 92: noventa y dos
93. 93: noventa y tres
94. 94: noventa y cuatro
95. 95: noventa y cinco
96. 96: noventa y seis
97. 97: noventa y siete
98. 98: noventa y ocho
99. 99: noventa y nueve
100. 100: cien

Accents and spelling traps that show up a lot

If you only memorize a handful of accent marks in 1–100, start here:

• dieciséis (16)
• veintidós (22)
• veintitrés (23)
• veintiséis (26)

Those accents aren’t random decoration. They follow Spanish stress and accent rules, and official spelling guidance treats them as part of the standard written form. If you’re writing for school, work, or exams, those marks matter.

“Cien” vs “ciento”

Use cien when the number is exactly 100. Use ciento when 100 starts a longer number:

• 100: cien
• 101: ciento uno
• 115: ciento quince

When 21 changes to “veintiún”

When 21 sits right before a masculine noun, veintiuno shortens to veintiún. Before a feminine noun, it becomes veintiuna. This agreement pattern is treated the same way as uno/una on its own, and it’s a common correction in edited Spanish writing. The RAE’s usage notes on numerals and their agreement are a clean reference point. RAE: gender agreement in cardinal numerals explains which forms change.

Number	Spanish spelling	Fast note
16	dieciséis	Accent mark appears in the fused “dieci-” form.
20	veinte	Base for the fused 21–29 set.
22	veintidós	Accent mark is part of standard spelling.
23	veintitrés	Accent mark is part of standard spelling.
26	veintiséis	Accent mark is part of standard spelling.
31	treinta y uno	Spaces stay; “tens + y + ones” pattern starts here.
40	cuarenta	No “qu-” at the start in standard spelling.
70	setenta	Spelling is fixed; don’t add extra letters.
100	cien	Switch to “ciento” when followed by more words.

Practice ideas that stick without busywork

Want this to stay in your head? Try these short drills. They feel simple, yet they train the exact build rules you’ll use in real writing.

Drill 1: Write the “anchors” from memory

Write these without looking: 1–15, 20, 30, 40, 50, 60, 70, 80, 90, 100. Then check your spellings against the list above.

Drill 2: Fill the 20s with the fused pattern

Write 21–29 in one go. Mark the accent numbers (22, 23, 26). If you stumble, re-read just that mini-run aloud.

Drill 3: Build random 30–99 numbers

Pick any ten (30, 40, 50, 60, 70, 80, 90). Add a random one (1–9). Write it as “ten + y + one.” Then swap the one for a different digit and repeat.

Drill 4: Use nouns so agreement feels normal

Write these pairs and read them out loud:

• 21 libros / 21 páginas
• 31 libros / 31 páginas
• 101 libros / 101 páginas

The goal isn’t speed. It’s zero hesitation when you need to write a price, an age, a date, a room number, or a count.