The typical size of paper used to carry one dose is 1/4" square. Cutting that into 10 equal sized pieces would be relatively tedious. It also assumes that the LSD is distributed evenly across the paper.
https://gimletmedia.com/episode/44-shine-on-you-crazy-goldma... At around 20:30, she starts talking about the process. Take the piece of acid, dissolve it in water overnight. Drink 1/10th of the bottle of water.
Or, y'know, an exacto knife and a ruler.