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Unit 1: First Steps Lesson 2 of 5

Numbers 1-20 & Counting

Números 1-20 y Contar
Count from 1 to 20
Pronounce numbers correctly
Use numbers in context
Ask "How many?"
Warm-up
Numbers Are Everywhere / Los Números Están en Todas Partes

Numbers are one of the first things you need in any language. Phone numbers, prices, addresses, ages — you use them every day. The good news? English numbers 1-10 are very short words!

Los números son una de las primeras cosas que necesitas en cualquier idioma. Números de teléfono, precios, direcciones, edades — los usas todos los días. ¿La buena noticia? ¡Los números del 1 al 10 en inglés son palabras muy cortas!

Vocabulary / Vocabulario
Numbers 1-10 / Números 1-10
1
one /wʌn/
uno
Tap to flip
2
two /tuː/
dos
Tap to flip
3
three /θriː/
tres
Tap to flip
4
four /fɔːr/
cuatro
Tap to flip
5
five /faɪv/
cinco
Tap to flip
6
six /sɪks/
seis
Tap to flip
7
seven /ˈsev.ən/
siete
Tap to flip
8
eight /eɪt/
ocho
Tap to flip
9
nine /naɪn/
nueve
Tap to flip
10
ten /ten/
diez
Tap to flip
Numbers 11-20 / Números 11-20

Numbers 11-12 are unique. Numbers 13-19 follow a pattern: they end in "-teen" (like "thirteen"). And 20 is "twenty."

Los números 11-12 son únicos. Los números 13-19 siguen un patrón: terminan en "-teen". Y 20 es "twenty."

11
eleven
once
Tap
12
twelve
doce
Tap
13
thirteen
trece
Tap
14
fourteen
catorce
Tap
15
fifteen
quince
Tap
16
sixteen
dieciséis
Tap
17
seventeen
diecisiete
Tap
18
eighteen
dieciocho
Tap
19
nineteen
diecinueve
Tap
20
twenty
veinte
Tap
💡 Asking "How many?" / "¿Cuántos?"
EnglishEspañol
How many?¿Cuántos/as?
How old are you?¿Cuántos años tienes?
I am ___ years old.Tengo ___ años.
Example
"How old are you?" — "I am twenty years old."
"¿Cuántos años tienes?" — "Tengo veinte años."
🇪🇸
Tip for Spanish Speakers
"Three" and the TH sound: The number "three" starts with the /θ/ sound (like the "z" in Spain's "zapato"). Put your tongue between your teeth and blow air. Don't say "tree" — say "three" /θriː/. "Three" y el sonido TH: El número "three" empieza con el sonido /θ/ (como la "z" en "zapato" en España). Pon tu lengua entre los dientes y sopla aire.
Multiple ChoiceExercise 1 of 3
What number is "fifteen"?
¿Qué número es "fifteen"?
A
50
B
15
C
5
D
14
🎉
Correct! Fifteen = 15. Remember: "-teen" numbers are 13-19.
💡
Not quite. Fifteen = 15. "Five" = 5, "Fifteen" = 15, "Fifty" = 50.
Fill in the BlankExercise 2 of 3
Write the English word for the number 12:
Escribe la palabra en inglés para el número 12:
🎉
Correct! 12 = Twelve. It's one of the two unique numbers (11 and 12).
💡
The answer is "twelve." 12 = twelve. Remember: 11 (eleven) and 12 (twelve) are unique!
Multiple ChoiceExercise 3 of 3
"I am eighteen years old." How old is this person?
"I am eighteen years old." ¿Cuántos años tiene esta persona?
A
18
B
8
C
80
🎉
Correct! Eighteen = 18. "Eight" = 8, "Eighteen" = 18, "Eighty" = 80.
💡
The answer is 18. "Eighteen" = 18. Remember the "-teen" pattern!
Key Takeaways
Numbers 1-10 are unique words: one, two, three... ten.
11 (eleven) and 12 (twelve) are irregular — just memorize them.
Numbers 13-19 end in "-teen": thirteen, fourteen, fifteen...
"How old are you?" = ¿Cuántos años tienes? → "I am ___ years old."
Lesson 1: Greetings Lesson 3: Alphabet