We have already mentioned the 100 adanim of the Mishkan, which represent the one hundred brachos.
The Tur (Orach Chaim 46) writes, "It states (Shmuel 2, 23:1), על הוקם, 'Dovid established על' and על is gematriya one hundred."
It also states (Bereishis 12:1), ...ואברכך ...לך לך ברכה והיה, "Go for yourself...and I will bless you...and you shall be a blessing.” The Zohar (vol.1, 76:) says that לך לך is gematriya one hundred. By reciting one hundred brachos, ברכה והיה, one merits receiving Hashem's brachos.
It is written (Tehillim 128:4), גבר יברך כן כי הנה, "Behold, for so is blessed the man who fears Hashem.” The Sefer HaManhig teaches that כי כן is gematriya one hundred because by saying one hundred brachos daily, he is blessed with all types of blessings.
The Torah lists ninety-eight curses for those who transgress the Torah, and then the Torah adds another two. As it states (Devarim 28:61), עד אליך 'ה יעלם ...מכה וכל חלי כל גם השמדך, "Even any illness and any blow... Hashem will bring upon you until you are destroyed.” Together, these are one hundred curses. The one hundred brachos nullify these one hundred curses.
In ancient sifrei Torah, there were tagin (crowns) over the 'ק in (Devarim 6:7) ובקומך, “when you rise.” The letter 'ק is gematriya one hundred, and ובקומך means "when you rise in the morning." The Baal HaTurim writes, "The tagin on the kuf in ובקומך imply that when one awakens in the morning, we should say one hundred brachos..."
The Levush writes, "This is the meaning of the pasuk (Devarim 10:12) מעמך שואל אלקיך 'ד מה ליראה אם כי, “What does Hashem, your G-d, ask from you? Only to fear...' Chazal say don’t read it מה, read it מאה, that Hashem is asking from us the one hundred brachos..."
