Perfect 4ths and 5ths sound very similar and can be hard to distinguish when both notes are played at once.
|Perfect 4th – Chord
|Perfect 5th – Chord
Inversion means taking the bottom note and moving it up an octave. It’s like flipping it over.
For example, if you had a Perfect 4th with the notes C and F, then moved the C up an octave, you would now have F and C, which is a Perfect 5th.
You can also try singing the individual notes.