"Učím ve čtyřech školách."
Translation:I teach in four schools.
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If you're asking when to use "v" and when to use "ve," the short answer is "V would change to VE if the consonant (or group of consonants) at the beginning of the following word would make V difficult to pronounce before that word." Other prepositions behave similarly.
I'm fairly sure I've seen a REAL explanation in one of the Tips and Notes sections, but I don't remember which one. :-(
Explanation in Tips and Notes Chapter Numbers 2: https://www.duolingo.com/skill/cs/Numbers-2/tips-and-notes