In our class we have a map of our municipality with scale 1: 500. The distance of our school from the beach is 12 cm on the map how much is the actual distance;

I dont really wanna give you the main anser  i know = Spioler alert

your clue is timesing, times the distance by the scale of the map

500 x 12 =6,000 cm

6000 / 100 =60 meters - actual distance to the beach.