A work on this material is very useful. You can acquire different piano playing skills- a good legato, ability to lead straight melodic line, so on. Providing regular practice of scales, chords and arpeggio, fingers, wrist and all hand gradually become mobile and flexible, the quality of sound improves and develops dexterity. First of all, you should learn every scale separately in each hand, using fingerings on pictures. Right-hand fingerings are written above the notes, left-hand fingerings - under the notes. Working on some scale, it is advisable to practice it for some time within one octave. Having mastered the fingering, you can start playing scales within two octaves. First, you should play at slow tempo, follow the straight performance of fingerings. When you've learned a scale separately in each hand, you should start playing it simultaneously in both hands. It is better to begin with the divergent movement (from the one key), so as this keeps symmetrical arrangement of fingerings; then set out to the parallel movement.
It is useful to play not only at one octave distance between hands, but also at two octave interval. Wide distance favors the sense of greater freedom of motions of the player, and both voices are more distinct. It is very important to listen, when you are playing scales. You should watch that sound legato proceed to the next sound. Sound of the scale should be clear and melodious. For this reason, motions of the hand have to be smooth, without jerking. Much attention should be devoted to cross over and pass under tricks, turns of wrist have to be smooth and lithe.