Hi Fast -- Unlike other JFK (John Fitzgerald Kennedy) half dollars, coins dated 1964 are made out of 90% silver. That's good. Your JFK half contains copper and 0.362 troy ounces of pure silver. The current price of pure silver is $23.93 US dollars per troy ounce, so your coin is worth 0.362 x 23.93 = $8.66.
The other coin is a novelty piece. For approximate value, see this page: