This is the last of the single hand exercises for a while.  It would get more interesting next as I tackle "Jingle Bells" with both hands.  Back to this exercise, it has me playing a fifth interval in both the treble and bass clefs.  I think I even sing.   Watch the hands, they do tricks.

Lesson 12,13

Both of these exercises are about intervals, 2nds, 3rds, 4ths, and 5ths.  I include them both here for completeness.  The My Fifth has a purported joke.  At least according to the author of the book.