Cardinal Numbers in Portuguese | 0 to 20

Cardinal number Portuguese PTBR PTPT
0 zero
1 um
2 dois
3 três
4 quatro
5 cinco
6 seis *
7 sete
8 oito
9 nove
10 dez
11 onze
12 doze
13 treze
14 catorze **
15 quinze
16 dezesseis (br) / dezasseis (pt)
17 dezessete (br) / dezassete (pt)
18 dezoito
19 dezenove (br) / dezanove (pt)
20 vinte

* In Brazil, “meia” (from meia dúzia = half a dozen) is frequently used to replace “seis” when spelling a large number such as telephone number or IDs. Mainly, this is to avoid confusion with the number three (três, seis sound similar in noisy environments)

** quatorze is also right and is the most used form in Brazil. But people pronounce it exactly the same way as catorze.