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<!DOCTYPE html>
<html>
  <head>
    <script src="//code.jquery.com/jquery-2.1.1.min.js"></script>
    <meta charset="utf-8">
    <title>JS Bin</title>
  </head>
  <body>
​
    <form>
      <input type="number" id="wakken" type="number" value=5><br>
      <input max="30" min="0" name="ijsberen" placeholder="Ijsberen" id="ijsberen" 
             type="number" value= "5"><br>
      <input max="30" min="0" name="wakken" placeholder="Penguins" id="penguins" 
             type="number" value= 0><br>
      <input type="button" value="submit" onclick="check()">
    </form>  
​
​
  </body>
</html>
 
​
 
var uw = document.getElementById("wakken");
var ui = document.getElementById("ijsberen");
var up = document.getElementById("penguins");
​
function check() {
  // Log Strings
  console.log(uw.value);
  console.log(ui.value);
  console.log(up.value);
  // Log Numbers
  console.log(Number(uw.value));
  console.log(+uw.value);
  console.log(parseInt(ui.value, 10));
  console.log(parseFloat(up.value));
}
Output

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