This exercise uses only the middle and the bass C. It exercises your eye-hand coordination, by having to follow the notes up and down with you eyes and coordinate your hands.
Very easy! This time, count the rhythm instead of singing the note names (they’re all C anyway..!).
I have added bar lines (the vertical lines that divide the score in parts, called measures or bars), rests and time signature (4/4).
This does not really change your playing in any way, just observe how the time signature (the two numbers in the beginning of the staff) tells us how many beats per measure (top number) and what note value that gets one beat (the bottom number).
In this case it is 4 beats per measure, and the bottom number 4 means that the quarter note is worth one beat. Observe how each measure adds up to four beats, but with different note values.
The small numbers are your finger number that plays that note. For this exercise, use only fingers 3 in each hand.