How it works
The number row sits right above the letters, like the top floor of a house. Count the floors going up: bottom letters, home row, top letters, then numbers.
Every finger owns a whole column of keys, from low to high. On the left, the pinky takes 1, the ring 2, the middle 3 and the pointer 4 and 5. On the right, the pointer takes 6 and 7, the middle 8, the ring 9 and the pinky 0.
Start with every finger at home, reach up two floors, tap the number and come straight back.
Keep your eyes on the screen, because your finger already knows the way.