An interval of more than an octave is compound: from the 9th, a compound 2nd, to the 15th, a compound octave. Take away 7 to find the simple interval.
Take away 7
An interval of more than an octave is a compound interval. Use the full number, or say compound with the simple interval. Take away 7 for the simple interval: a 10th is a compound 3rd, a 12th a compound 5th, a 15th a compound octave.
Quick check
What is the simple equivalent of a 13th?
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