ל׳ בניסן ה׳תש״פ
- Until the tenth day of the counting, we say יָמִים, yamim, [e.g., sheesha yamim] and from the eleventh day and on we say יוֹם, yom[e.g., ached asar yom]. Also, we say [in Hebrew] the smaller number first, such as: “Today is one-and-twenty days,” rather than, “twenty-one days.” These wordings are not critical but are only for the sake of clarity [in the Hebrew language] (Mishnah Berurah 489:9).
2. Even if one said the count of days using some other formula, such as on the thirty-ninth day he said, “Today is forty minus one,” he fulfilled his obligation (ibid.).
"Moshe corrected them to Israel, to be asks and demands on the day's issue, laws of Pesach on Passover, laws of Atzeret at the assembly, the laws of festival on the festival" (Megillah 32) 1
Last days lessons Subject: Chagim