Spanish · Pronunciation Guide
trehs, one syllable — the r is a single quick tap, not an English curl.
A single syllable, so stress has nowhere to go. The word matters for the rule anyway: because "tres" ends in s, its longer relatives inherit that ending and follow the default — "trescientos" lands on tres-CIEN-tos with the beat on the second-to-last syllable.
Listen: tres
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Son las tres de la tarde.
It's three in the afternoon.
Listen: Son las tres de la tarde.
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"Son las tres de la tarde" shows Spanish telling time with a plural verb and a plural article — "son las" because three is more than one. Only one o'clock takes "es la". The phrase "de la tarde" is how Spanish marks p.m., and its d sits between vowels in running speech, softening toward a th sound.
The "tr" cluster is the whole difficulty. English speakers produce "tresh" or "chres", because in English a t before r turns into something close to "ch" — listen to how you actually say "tree". Spanish keeps the two sounds separate and distinct: a dry dental t, then a single forward tap. Slow it down to t-eh-res and speed it up gradually, and the cluster sorts itself out.