JavaScript - Why isn't this working? I can't see the difference -

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i'm starting out here i've got these 2 sections of js code. first block example book copied , pasted, second block 1 typed out , (in eyes) identical first block. when run code, second block (the 1 typed) doesn't work. i've looked @ each character , can't find out why. 

<!doctype html> <html lang="en">     <head>         <title>chapter 2, question 2</title>     </head>     <body>         <script>             var firstnumber = parsefloat(prompt("enter first number",""));             var secondnumber = parsefloat(prompt("enter second number",""));             var thetotal = firstnumber + secondnumber;              document.write(first number + " added " + secondnumber + " equals " + thetotal);         </script>     </body> </html>

there space in first number.

this:

document.write(first number + " added " + secondnumber + " equals " + thetotal);

should be:

document.write(firstnumber + " added " + secondnumber + " equals " + thetotal);

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