To count up to 13 in Spanish, start with Uno (1) and increment by one for each number: Dos (2), Tres (3), Cuatro (4), Cinco (5), Seis (6), Siete (7), Ocho (8), Noveno (9), Decimo (10), Undécimo (11), Duodécimo (12), and finalmente, Trece (13). Don't forget to pronounce each number correctly: Uno is 'wah-noh', Dos is 'dohs', Tres is 'trays', and so on. With this basic understanding of Spanish numerals, you'll be well-equipped to navigate everyday situations during your trip.