Two years ago, I applied for and got a grant for 30 ukulele’s for my 6th graders. They have loved them. I love the ukulele because the kids can learn to play an instrument, but they are still singing as well. They can use all of the musical knowledge they have accumulated to sing and play musically.
I start by having them sing the songs before we start. It is difficult to do both at the same time.
I use this book because it has many folk songs with 2 and 3 chords that use the chords that are most useful for a beginner.