If you go up a P5th from D, which note do you land on?

It looks like you are asking about going up a Perfect 5th from D on the keyboard. From D, the tonic note, you will end up on the note A if you want a Perfect 5th chord.

Perfect 5ths are made up of seven half steps. So, if you follow on the keyboard, you will see a progression like this: D, D#, E, F, F#, G, G#, A. (# symbolizes sharp).

Also, here's an easier...

It looks like you are asking about going up a Perfect 5th from D on the keyboard. From D, the tonic note, you will end up on the note A if you want a Perfect 5th chord.

Perfect 5ths are made up of seven half steps. So, if you follow on the keyboard, you will see a progression like this: D, D#, E, F, F#, G, G#, A. (# symbolizes sharp).

Also, here's an easier way to recognize perfect 5ths if you prefer not to count half steps. All fifths are perfect without sharps or flats unless you are referring to B and F. To get a perfect 5th here, you will need B and F sharp. The progression will look like this: B, C, C#, D, D#, E, F, F#. (To check, you can see that it's seven half steps from B to F sharp).

For notes with no sharps or flats:

1)From C to G is a perfect 5th.

2)From E to B is also a perfect 5th.

If both notes are sharped or flatted, they will still be Perfect 5ths. Try these:

1)From C sharp to G sharp ( C#, D, D#, E, F, F#, G, G#).

2)From A flat to E flat ( A flat, A, B flat, B, C, D flat, D, E flat).

Try other combinations if you like, but the principle still holds the same. Happy playing!