Thank you to Bonnie Shams, OTR for her comment about Type Fun app, a keyboarding game app for the iPad and iPhone.
Available in a lite and full version (.99) with more words provided in the full version. Practice levels for beginning and practiced typists are options with speed settings and word selections provided in a fun game format!
As always practice on a standard keyboard using touch typing technique is recommended as the standard method of typing instruction. Use of a Bluetooth keyboard (such as Apple Wireless Keyboard or Logitech Tablet Keyboard for iPad ) or a wired keyboard is possible (see how to connect a standard keyboard to an iPad using the iPad Camera Connection Kit on this previous post : Keyboarding Practice on Your iPad or Android ) with your iPad. Be sure to use good ergonomic positioning when practicing keyboarding!
Thank you again to Bonnie for her recommendation. Another free tool for your iTool Kit!