All circulation 1971 and later halves are made of copper-nickel, not silver, so they have no added value if you found it in change.
A nice uncirculated 1981-P half might bring $1 to $8 depending on quality. A 1981-D would be $1 to $12.
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If you mean a 1998 Kennedy half dollar, the coin has no silver in it and is worth face value.
About $15.00, retail.
The coin is only face value.
50¢. It's an ordinary circulation coin.
It's just a common date half dollar that's still found on circulation, spend it.