How many syllables are in the word that's?

Answer 1

The word 'that' has one syllable.

A hint for you, each time you say a word, use your hand to hit your chin when there is a "bump" in the word. Ex: Syllables, is Syl-La-bles is three.

(Hold your hand under your chin, and each syllable will open your jaw to hit it.)

Answer 2

Either 1 or 2, depending on how you say it.