In a bar of sixteenth notes in * time, there are 16 different positions for notes within the bar. The first beat is 1, the second note of the first group of four is called the "e of one" the third note of the first group is called the "and of one", and the fourth note of the first group is called the "a of one".
As with other subdivisions of the beat, the system then continues through the bar – 2, e of 2, and of 2, a of 2, etc.
As with triplets and eighth notes, a good way to master the use of 16th notes is to strum constant 16ths with the right hand and select which part of the beat will sound by pressing down with the left hand. The other parts of each beat should be sounded as percussive strums. Here are some exercises using this technique. Be sure to use your metronome, count out loud and tap your foot on the beat without any hesitating or extra taps between beats.