Q. If one lost track on Shabbos of where he is holding in meah brachos, should he make brachos until he knows without any doubt that he has a hundred, or is it not necessary since the mitzvah is rabbinic?
A. Horav Shlomo Miller’s Shlit’a opinion is that although this mitzva is Rabbinical, one should try his best to fulfill its obligation, especially since it is not a difficult task to accomplish. Taking into account that you can also comply by listening to the brochos recited by the ones getting an aliya to the Torah.
Rabbi A. Bartfeld as advised by Horav Shlomo Miller and Horav Aharon Miller Shlit’a