Portuguese (Brazil) · Pronunciation Guide
SAYNG — one nasal syllable. The c is soft, and the -em ending is a nasal diphthong, not a plain "em."
One syllable, so stress is automatic, and no accent is written. Worth noting for later: words ending in -em or -ens follow the second-to-last-syllable rule when they're longer, which is why "jovem" is stressed on the first syllable while "também" needs an accent to override that default.
Listen: cem
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Custa cem reais.
It costs a hundred reais.
Listen: Custa cem reais.
Free browser voice. Hear it read by a real native speaker inside the LingoDrop app.
"Custa cem reais" gives you the nasal ending running straight into an r-initial word. That r at the start of "reais" is the harsh throat-h, so you hear "sayng-heh-AISS." And "reais" itself ends in a diphthong plus s — the plural of the currency, real, made irregularly.
The obvious error is "sem" with the lips closing on an m, which also collides confusingly with the actual word "sem" meaning "without" — though that one is pronounced "sayng" too, so context carries the load. The bigger issue is reading the c as a k: "kem" is not a word. Keep it soft, keep the nasal open.