Exercises in octaves | piano

A player with a sufficiently large hand may use the third finger in the following exercises.

How to play connected octaves | piano

Fingering to be used when playing them slowly

When playing octaves the performer should connect them as much as possible by a skillful gliding of the thumb and fingers, using the 3d and 4th fingers on the black key as well as by passing the 3d and 4th fingers over the 5th.