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12. A dotted half note is like three quarter notes. One quarter note = 4 sixteenth notes. So, 3 x (4 sixteenth notes) = 12 sixteenth notes.
Starting with A, an octave is A, A#, B, C, C#, D, D#, E, F, F#, G, G#, and again, A. The interval between each two successive notes is called a half-step. Therefore, there are 12 intervals of a half-step forming what is called an octave. For starters, each octave up or down represents a doubling of frequency. For example, the A above middle C on the piano is set to the standard value of 440 Hz, so the A an octave above that has a frequency of 880 Hz. Now, the particulars. The half-step is the smallest interval recognized in Western musical theory.