These measures are divided correctly so that they equal four beats per measure.

These are in 2/4 time. They have two beats per measure. Remember that an eighth not equals one half of a beat, a quarter not equals one beat, a half note equals two beats, and a whole note equals four beats. To make these measures in 4/4 (four beats per measure) you would have to add four eight notes, two quarter notes, or one half note to each measure.

The "maple leaf rag" (copyright registered on september 18, 1899)[1] is an early ragtime musical composition for piano composed by scott joplin. it was one of joplin's early works, and became the model for ragtime compositions by subsequent composers. it is one of the most famous of all ragtime pieces.[2] as a result joplin was called the "king of ragtime". the piece gave joplin a steady if unspectacular income for the rest of his life.