In Spanish, "55" is "cincuenta y cinco". This phrase is pronounced as /θinˈkwenta i ˈθinko/ using the International Phonetic Alphabet (IPA) . Other alternative expressions that can also be used to express the number "55" in Spanish include "cincuenta más cinco" (fifty plus five) and "cinco decenas y cinco unidades" (five tens and five units) . Here are some sample sentences to help you practice:

• Necesito comprar cincuenta y cinco naranjas para la fiesta. (I need to buy 55 oranges for the party.)
• Su nuevo apartamento está en el quincuagésimo quinto piso. (Her new apartment is on the 55th floor.)
• El límite de velocidad en esta carretera es de cincuenta y cinco millas por hora. (The speed limit on this road is 55 miles per hour.)