However, most commonly and easily, scales can be transcribed using the numeric method describing the semitone between the notes of a scale as can be seen above (Suspended Pentatonic = 2 3 2 3 2). The numeric method is useful because the sum of the semitones between notes will always add to twelve. This is common of chords as well.
This means, mathematically, the formulas of chords and scales can be represented by all the combinations of numbers that add to twelve. Because of this simplicity, this book uses the numeric method to describe the formulas of chords and scales in lieu of the two previously described methods. And though not helpful in everyday use, the formulas of chords and scales have been recorded numerically for documentation and archival purposes.