Place the very tip of your tongue slightly between your teeth. Blow air gently around it without voicing.

Americans pronounce three as THREE (/θri/). You'll hear it in sentences like "Think of three things" or "Three trees are green" — more examples below.
Record yourself saying "three" and play it back. The mic stays on your device — nothing's uploaded.
1 syllable, 3 sounds. Explore each sound's mouth shape and how it's made.
Place the very tip of your tongue slightly between your teeth. Blow air gently around it without voicing.

Curl or bunch your tongue without letting the tip touch the roof of your mouth. Brace the sides of your tongue against your upper back teeth, and round your lips slightly.
Pull the corners of your lips back slightly. Arch the middle-front of your tongue high toward the roof of the mouth.

Click any sentence to see the full breakdown — every link, every reduction, every flap-T.