Cardinal (how many?) and ordinal (which one?) numbers, agreement and usage.
Hebrew distinguishes between cardinal and ordinal numbers. Often agreement with the noun’s gender and number is required. Some forms are irregular.

In Hebrew, every noun has a grammatical gender: masculine or feminine. This affects other words in the sentence.
Important: There’s no absolute rule for every noun, you often memorize the gender.
A 6‑part course to master numbers
When referring to one (masc./fem.), the number comes after the noun and agrees with its gender.
When using number 1, it comes after the noun and agrees in gender.
יֶלֶד אֶחָד
one boy
יַלְדָּה אַחַת
one girl
In construct with a noun, the form changes: shnei (masc.), shtei (fem.).
Construct forms: shnei (masc.) / shtei (fem.)
שְׁנֵי יְלָדִים
two boys
שְׁתֵּי יַלְדּוֹת
two girls
Each number has masculine and feminine forms which match the noun.
Numbers have masculine/feminine forms that match the noun.
שְׁלוֹשָׁה יְלָדִים
three boys
חֲמִשָּׁה סְפָרִים
five books
שָׁלוֹשׁ יַלְדּוֹת
three girls
חָמֵשׁ מַחְבָּרוֹת
five notebooks
For 11–19, the units digit matches the noun’s gender; ‘asar/eshre’ also shows gender.
Units determine gender; also ‘asar/eshre’ shows gender.
אֶחָד עָשָׂר סְפָרִים
שְׁנַיִים עָשָׂר תַּלְמִידִים
שְׁלוֹשָׁה עָשָׂר כִּסְאוֹת
אַחַת עֶשְׂרֵה מַחְבָּרוֹת
שְׁתַּיִים עֶשְׂרֵה טֵלֵוִיזְיוֹת
שָׁלוֹשׁ עֶשְׂרֵה יַלְדוֹת
‘asar’ (masc.) vs ‘eshre’ (fem.)
For round tens (20, 30, 40... 90) the forms are the same for masculine and feminine.
Round tens are gender-neutral, one form for both.
עֶשְׂרִים סְפָרִים / עֶשְׂרִים מַחְבָּרוֹת
20 books / 20 notebooks
אַרְבָּעִים כִּסְאוֹת / אַרְבָּעִים טֵלֵוִיזְיוֹת
40 chairs / 40 televisions
שִׁשִּׁים רְחוֹבוֹת / שִׁשִּׁים תַּלְמִידִים
60 streets / 60 students
In compound numbers the tens stay fixed; the units digit agrees with the noun’s gender.
Tens stay the same; units agree in gender.
עֶשְׂרִים וְאֶחָד סְפָרִים
21 books
שְׁלוֹשִׁים וּשְׁנַיִים תַּלְמִידִים
32 students
אַרְבָּעִים וּשְׁלוֹשָׁה כִּסְאוֹת
43 chairs
עֶשְׂרִים וְאַחַת מַחְבָּרוֹת
21 notebooks
שְׁלוֹשִׁים וּשְׁתַּיִים יַלְדוֹת
32 girls
אַרְבָּעִים וְשָׁלוֹשׁ טֵלֵוִיזְיוֹת
43 televisions