When counting use female forms.
In Hebrew numbers can also be expressed in letters. School classes are denoted with letters, not with numbers, often also the chapters of a book.
Note, that numbers of male gender have female endings – eg shloshah (three), shishah-asar (16) and vice versa. This even irritates Israelis; genders of numbers are often used wrongly in Hebrew.
*The numbers 15 and 16 are not shown as yud-he und yud-vav (10 + 5 and 10 + 6), but as tav-vav טו and tav-zayin טז (9 + 6 and 9 + 7), in order to avoid similarities with the name of G-d (tetragrammaton).
Also dates can be expressed in letters. According to Judaism, the world was created 3760 years BCE.
Thus the year 2001 CE is the jewish year 5761 (3760 + 2001).
The jewish date 5761 is rendered as 761, the initial 5 is omitted. 761 is depicted as 400 (ת) + 300 (ש)+60 (ס)+1(א) – ‘אתשס – pronounced as tashsah.
2008 (+3760) is 5768 – תשס”ח – tashßach.