Ordinal Numbers מִסְפָּרִים סִדּוּרִיִּים

The everyday set is רִאשׁוֹן, שֵׁנִי, שְׁלִישִׁי, רְבִיעִי, חֲמִישִׁי, שִׁשִּׁי, שְׁבִיעִי, שְׁמִינִי, תְּשִׁיעִי, עֲשִׂירִי, with feminine רִאשׁוֹנָה, שְׁנִיָּה, שְׁלִישִׁית, and so on. Feminine 3–10 typically end in ־ִית. These are the forms you need for dates of the month in speech, floors, and “first time.”

Say הַשִּׁעוּר הָרִאשׁוֹן, not ראשון השיעור. Indefinite phrases omit הַ on both: שִׁעוּר רִאשׁוֹן can label “lesson one” on a worksheet. After a feminine noun you need the feminine ordinal: הָרַכֶּבֶת הַשְּׁנִיָּה, not השני.

Above ten, Israeli speech often just uses the cardinal with a definite noun: הַיּוֹם הָעֶשְׂרִים, הַקּוֹמָה הָאַחַת עֶשְׂרֵה. Written style may still build an ordinal. For dates you will hear בְּשִׁשָּׁה בְּמַאי beside יוֹם שִׁשִּׁי; weekday names שֵׁנִי through שִׁשִּׁי are the same roots as the ordinals.