"Played" has one syllable. The ending "-ed" has no vowel (even though it is written with one), so it does not add a syllable to "play". In words ending in "t" or "d", a vowel is added before this ending, so in those cases, you do wind up with an extra syllable.
1 syllable
There are 2 syllables in the word "play-ground."
Playing has two syllables. The syllables are play-ing.
1
1
there are 2 dis-play
1 + 2 = 3 syllables
1
2.
1
1
1
"It's" has 1 syllable. "It is" has 2 syllables.