In short

Modern Hebrew has two full sets of the numbers 1–10, and you pick the set by the gender of the thing you are counting. The twist that surprises everyone is that the choice runs backwards from what the endings suggest: the numbers that end in ־ה (-a) — שלושה (shlosha), ארבעה (arba’a), חמישה (chamisha) — the very ending that means “feminine” on a noun, are the forms you use with masculine nouns. The bare, ־ה-less numbers שלוש (shalosh), ארבע (arba), חמש (chamesh) go with feminine nouns. This mismatch is called תקבולת המין, “gender polarity”.

Two numbers behave specially. “One” comes after its noun and simply agrees with it like an adjective: ילד אחד (yeled echad), ילדה אחת (yalda achat). “Two” has a short bound form שני / שתי (shnei / shtei) that clips onto the front of a noun, and a free-standing form שניים / שתיים (shnayim / shtayim) used only when nothing follows. Everything from 3 to 10 stands in front of a plural noun.

The rule

Numbers come before the noun — except “one”. For 2–10 the number precedes a plural noun: שלושה ספרים (shlosha sfarim) ‘three books’, חמש בנות (chamesh banot) ‘five girls’. Only אחד / אחת (‘one’) follows its noun, like an adjective: ספר אחד (sefer echad), מיטה אחת (mita achat).

Two sets, chosen by the noun’s gender. Each of 3–10 has a masculine-noun form and a feminine-noun form. Decide which to use by the lexical gender of the counted noun (lesson 3), the same gender that drives adjective and verb agreement — not by anything you see on the surface of the plural.

The polarity is inverse — this is the whole trick. The forms that end in ־ה count masculine nouns; the bare forms count feminine nouns:

• masculine: שלושה בנים (shlosha banim) ‘three sons’, חמישה שקלים (chamisha shkalim) ‘five shekels’, עשרה אנשים (asara anashim) ‘ten people’;
• feminine: שלוש בנות (shalosh banot) ‘three daughters’, חמש שאלות (chamesh she’elot) ‘five questions’, עשר דקות (eser dakot) ‘ten minutes’.

So the ־ה on שלושה is not a feminine marker here — read it as the masculine-counting form and pair it with a masculine noun.

“One” agrees like an adjective. אחד (echad) follows a masculine noun, אחת (achat) follows a feminine noun, matching gender the way any adjective would: יום אחד (yom echad) ‘one day’, שנה אחת (shana achat) ‘one year’. It is the only number that sits after the noun and the only one that does not show the polarity flip.

“Two” has a bound form and a free form. Before a noun, use the construct (bound) form: masculine שני (shnei) + noun, feminine שתי (shtei) + noun — שני ספרים (shnei sfarim) ‘two books’, שתי דלתות (shtei dlatot) ‘two doors’. The absolute forms שניים (shnayim) / שתיים (shtayim) stand alone — when you answer “how many?” with just “two”, or when you count out loud — and are never placed directly before a noun.

Check the gender, not the plural ending. A noun’s plural suffix can point the “wrong” way (lesson 4): שנה (shana) is feminine but pluralizes שנים (shanim), and כיסא (kise) is masculine but pluralizes כיסאות (kis’ot). The number still follows the fixed gender: שבע שנים (sheva shanim, feminine number) and ארבעה כיסאות (arba’a kis’ot, masculine number). Ignore the ־ים / ־ות you see; count by the gender you learned with the word.

A couple of notes. שמונה is written the same for both genders — masculine shmona and feminine shmone are one unvocalized spelling, so let the noun tell you how to say it. And when you recite numbers with no noun (counting, doing sums, reading a phone number), Israelis default to the feminine set: אחת, שתיים, שלוש, ארבע…

Forms & patterns

The two sets for 3–10 — the ־ה forms count masculine nouns, the bare forms count feminine nouns:

“One” — follows the noun and agrees like an adjective:

“Two” — bound form before a noun, absolute form standing alone:

Examples

Common mistakes

• שלוש בנים -> שלושה בנים (shlosha banim) - בנים is masculine, so it takes the ־ה-ending number; the bare form is for feminine nouns.
• שלושה בנות -> שלוש בנות (shalosh banot) - בנות is feminine, so it takes the bare form; the ־ה form is reserved for masculine nouns.
• חמש שקלים -> חמישה שקלים (chamisha shkalim) - שקל is masculine, so the number is the ־ה form; do not read that ־ה as feminine.
• ילדה אחד -> ילדה אחת (yalda achat) - “one” agrees like an adjective, so a feminine noun needs אחת, not אחד.
• אחד ילד -> ילד אחד (yeled echad) - “one” comes after its noun; only 2–10 stand in front of the noun.
• שניים ספרים -> שני ספרים (shnei sfarim) - before a noun use the bound form שני, never the standalone שניים.
• שתיים דלתות -> שתי דלתות (shtei dlatot) - the absolute שתיים cannot sit before a noun; use the bound שתי.
• שבעה שנים -> שבע שנים (sheva shanim) - שנה is feminine even though its plural שנים looks masculine; count by the gender, not the ending.

Tips

• Reverse your instinct: the ־ה-looking number (שלושה) goes with masculine nouns, the bare number (שלוש) with feminine. Drill the pair “shlosha banim / shalosh banot” until the flip feels automatic.
• Only “one” behaves like an adjective — it follows the noun and matches its gender (ילד אחד / ילדה אחת). Everything from 2 to 10 comes before the noun.
• Keep the two shapes of “two” apart: bound שני / שתי glued in front of a noun, free שניים / שתיים only when nothing follows (answering “how many?” or counting aloud).
• Pick the number by the noun’s lexical gender (lesson 3), never by the plural suffix — שנים and כיסאות end in “wrong” letters, yet their nouns’ genders still decide the form.
• שמונה is one spelling for both genders (shmona with masculine nouns, shmone with feminine); let the noun tell you how to read it.
• When you count with no noun — reciting numbers, doing sums, reading out a phone number — use the feminine set: אחת, שתיים, שלוש, ארבע…
• Leave 11 and up, telling the time, and ordinals (“first, second”) to later lessons; here just lock in 1–10 with concrete, countable objects.