Am pentatonic is the 1,3,4,5,7 notes from the Am scale A, C, D, E, G move the A from first to last and you have C, D, E, G, A which are the 1,2,3,5,6 notes of the CMaj scale (this is the C major pentatonic scale). So in short, yes add the 4th (F) and 7th (B) notes to the scale and you've got a...