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Most modern pianos have a row of 88 black and white keys, 52 white keys for the notes of the C major scale (C, D, E, F, G, A and B) and 36 shorter black keys, which are raised above the white keys, and set further back on the keyboard.
You then have understood the an octave is a group of 8 white keys and 5 black keys giving the total of 13 keys per octave. You also understand that the 88 keys on the piano isnât just about the octaves, as the total keys in the octave are 85 and that there are 3 more keys to find.