a) the numbers

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.

femalemaleletter1st, 2nd ten's
etc. letter
0אפסאפסm / w
efesefes
1אחתאחדראשון, -ה
achatechadrishon / -a
2שתים / שתישנים / שנישני, -הכ' - 20עשרים
shtayimshnayimsheni / shniahesrim
3שלוששלושהשלישי, -תל' – 30שלושים
shaloshshloshahshlishi / -tshloshim
4ארבעארבעהרבעי, -תמ' – 40ארבעים
arbaharba’ahrevi’i / -tarba’im
5חמשחמישהחמישי, -תנ' – 50חמישים
chameshchamishahchamishi / -tchamishim
6שששישהשישי, -תס' – 60שישים
sheshshishahshishi / -tshishim
7שבעשבעהשביעי, -תע' – 70שבעים
shevashiv’ahshvi’i / -tshiv’im
8שמונהשמונהשמיני, -תפ' – 80שמונים
shmoneshmonahshmini / -tshmonim
9תשעתשעהתשעי, -תצ' – 90תשעים
teshatish’ahtish'i / -ttish’im
10עשרעשרהעשירי, -תק' - 100מאה
eserasarahasiri/-tme’a
11אחת-עשרהאחד-עשרי"א
achat-esrehechad-asar
12שתים-עשרהשנים-עשרי"בהשתים עשרי
השנים עשר
shtem-esrehshnem-asarha-shtem-esre the 12th f
13שלוש-עשרהשלושה-עשרי"גha-shnem-asar the 2th m
shlosh-esrehshlosha-asar
14ארבע-עשרהארבע-עשרי"ד
arbah-esreh arba’ah-asar
15חמש-עשרהחמישה-עשר*ט"ו
chamesh-esrehchamishah-asar
16שש-עשרהשישה-עשר*ט"ז
shesh-esrehshishah-asar
17שבע-עשרהשבעה-עשרי"ז
shvah-esrehshiv’ah-asar
18שמונה-עשרהשמונה-עשרי"ח
shmoneh-esrehshmonah-asar
19תשע-עשרהתשע-עשרי"ט
tsha-esrehtish’ah-asar
20עשריםעשרים
esrimesrim
21עשרים ואחת עשרים ואחדכ"א
esrim ve’achatesrim ve’echad
22עשרים ושתיםעשרים ושניםכ"ב
esrim u-shtayimesrim u-shnayim
100מאה
mea
200מאתיים
ma’atayim
300שלוש-מאות
shlosh+me’ot
400ארבע-מאות
arba+me’ot
1000אלף
elef

*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.