The method of quickly tying balloons is as follows:

First, let's blow up the balloon, but not too much. Hold the end of the balloon with your left hand for about 5mm, wrap the balloon with your index finger, touch the end of the balloon, fix it with your thumb, fix the end of the balloon in the direction of the fingertip of your index finger with your right hand, pull out your index finger, and push the end of the balloon with your right hand.

After pushing, pull it out, tie a knot, tighten it, and a balloon will be tied.