Hebrew numerals

The Hebrew language has names for common numbers that range from zero to one million. Letters of the Hebrew alphabet are used to represent numbers in a few traditional contexts, such as in calendars. In other situations, numerals from the Hindu–Arabic numeral system are used. Cardinal and ordinal numbers must agree in gender with the noun they are describing. If there is no such noun (e.g., in telephone numbers), the feminine form is used. For ordinal numbers greater than ten, the cardinal is used. Multiples of ten above the value 20 have no gender (20, 30, 40, ... are genderless), unless the number has the digit 1 in the tens position (110, 210, 310, ...).

The lower clock on the Jewish Town Hall building in Prague, with Hebrew numerals in counterclockwise order

Early 20th century pocket watches with Hebrew numerals in clockwise order (Jewish Museum, Berlin)

The Hebrew numeric system operates on the additive principle in which the numeric values of the letters are added together to form the total. For example, 177 is represented as קעז‎ which (from right to left) corresponds to 100 + 70 + 7 = 177.

Mathematically, this type of system requires 27 letters (1-9, 10–90, 100–900). In practice, the last letter, tav (which has the value 400), is used in combination with itself or other letters from qof (100) onwards to generate numbers from 500 and above. Alternatively, the 22-letter Hebrew numeral set is sometimes extended to 27 by using 5 sofit (final) forms of the Hebrew letters.[7]

A tombstone from 1935 in Baiersdorf, Germany, reading:

נפטר ביום כׄ אייר‎
ונקבר ביום כׄגׄ אייר‎
שנת תׄרׄצׄהׄ לפׄק‎

In English:

Passed away on day 20 Iyar
And buried on day 23 Iyar
Year 695 without the thousands [i.e. year 5695]

Note the dots above each letter in each number.

Gershayim (U+05F4 in Unicode, and resembling a double quote mark) (sometimes erroneously referred to as merkha'ot, which is Hebrew for double quote) are inserted before (to the right of) the last (leftmost) letter to indicate that the sequence of letters represents something other than a word. This is used in the case where a number is represented by two or more Hebrew numerals (e.g., 28 → כ״ח‎‎).

Similarly, a single geresh (U+05F3 in Unicode, and resembling a single quote mark) is appended after (to the left of) a single letter to indicate that the letter represents a number rather than a (one-letter) word. This is used in the case where a number is represented by a single Hebrew numeral (e.g. 100 → ק׳‎‎).

Note that geresh and gershayim merely indicate "not a (normal) word." Context usually determines whether they indicate a number or something else (such as an abbreviation).

An alternative method found in old manuscripts and still found on modern-day tombstones is to put a dot above each letter of the number.

In print, Arabic numerals are employed in Modern Hebrew for most purposes. Hebrew numerals are used nowadays primarily for writing the days and years of the Hebrew calendar; for references to traditional Jewish texts (particularly for Biblical chapter and verse and for Talmudic folios); for bulleted or numbered lists (similar to A, B, C, etc., in English); and in numerology (gematria).

Thousands are counted separately, and the thousands count precedes the rest of the number (to the right, since Hebrew is read from right to left). There are no special marks to signify that the "count" is starting over with thousands, which can theoretically lead to ambiguity, although a single quote mark is sometimes used after the letter. When specifying years of the Hebrew calendar in the present millennium, writers usually omit the thousands (which is presently 5 [ה‎]), but if they do not this is accepted to mean 5,000, with no ambiguity. The current Israeli coinage includes the thousands.

The Abjad numerals are equivalent to the Hebrew numerals up to 400. The Greek numerals differ from the Hebrew ones from 90 upwards because in the Greek alphabet there is no equivalent for tsade (צ‎).

• Bible code, a purported set of secret messages encoded within the Torah.
• Gematria, Jewish system of assigning numerical value to a word or phrase.
• Hebrew calendar
• Notarikon, a method of deriving a word by using each of its initial letters.
• Sephirot, the 10 attributes/emanations found in Kabbalah.
• Significance of numbers in Judaism
• Base 32, a system that can be written with both all Arabic numerals and all Hebrew letters, much as how Base 36 is written with all Arabic numerals and roman letters.

Wikimedia Commons has media related to Clocks with Hebrew numerals.

•  Gesenius' Hebrew Grammar, §97, §98, §134
• Gematria Chart on inner.org
• Hebrew Number Chart 1 to 1 Million with English Transliteration
• Learn to say any number in English with Transliteration