Coin Magic - The coin flip

Right hand has a half dollar classic palmed, while the fingers flip another coin into the air a time or two. This is merely a disarming move which tends to show, without saying so, that the right hand holds only one coin. The spectators reason that there is only one because it seems impossible that a second coin could be hidden in the hand flipping a coin in the air so naturally.

Image A shows the concealed coin in the palm and the visible coin ready to be flipped into the air. Coin is caught on the extended fingers as shown in the second image B. Back of hand is obviously towards spectators. That way they won't see a thing.
So practice, practice, practice because it's an useful technique

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This dvd consist of the complete multiple bill change routines with 4 incredibly visual segments including the best ending that leaves everybody laughing.
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Boris Pocus - Extremely Mental

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Coin Magic - Downs palm

The coin is held horizontally in the fork of the thumb by pressure of the latter and the base of the first finger pressing together against opposite edges. Image A shows this position but from a different angle than viewed by the audience (the image does not get to see your hand as in image A).
To bring the coin to this position, hold it vertically between the tips of the first two fingers, as in image B. Then curl these two fingers inward, depositing the coin behind the thumb, where it is gripped against the base of the first finger. When the fingers are straightened the hand appears empty, as in image C.

Coin Magic - The Thumb Palm

The coin is clipped by its edge in the fork of the thumb by pressure against the base of the first finger (figure A). The coin should be held rather loosely to permit the thumb to assume as natural a position as possible. Practice this in front of a mirror.
To place the coin in this position, begin with it between the tips of the first two fingers (figure B). Curl these two fingerss inward until the top edge of the coin touches the upper palm at the crotch of the thumb, then bring the thumb down and grip it by its edge (figure C) as the fingers straighten out.
To transfer the coin from the thumb palm to the classic palm, bend the second and third fingers inward as you lower the thumb (which action brings the coin closer to the palm), press the tips of these two fingers against the flat side of the coin and press it into the palm.

Coin Magic - The Classic Palm

The coin is held in the center of the palm by the contraction of the muscles at the base of the thumb and little finger. Basically is like trying to hold something in your hand, but without getting a grip on the object by using your finger.
Not just one, but several coins may be held in this manner. This is one of the most difficult of concealments to master, but it is worth learning it because it is one of the finest. No one thinks it possible to conceal a coin in this way.

If you're an adult try practicing with a half-dollar or a loonie. If you have a smaller hand I would recommend using a quarter.