u can tell it by the style of dance they are dancing the costumes they are wearing.
It's not possible to know how many because not all dances are known. Also new ones are created every day.
Sapatya- from porac, pampanga Basulto- from Tarlac City
Folk dances are traditional dances from our ancestors and are already a part of our history. Modern dances are dances from the new century.
my answer is atin cu pung sing-sing