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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.
The dot gives the note 50% more length. Therefore a dotted eigth note is worth 3/4 of a beat, a dotted half note is worth 3 beats and so on. The time signature doesn't make any difference to the length of the note (although it will make a difference to the number of beats - as changing the time signature changes the beat)