Part 3 · Rudiments · Chapter 38
A five-stroke roll is two double strokes followed by an accented single: R R L L R. It is written as a note with slashes (the roll) tied to an accented note.
Each roll starts on the beat and lands on the &. Then start again with the other hand: LLRR L.
The same roll written as individual notes, slowly. The doubles are 32nd notes; here they are shown as sixteenths at half speed.
Every short roll ends with an accented single stroke. Aim for that last note: the doubles just lead into it.