The order of the days
See below how the cardinal numbers are applied to the rest of the week.
Monday is Yom Sheni (יום שני) and comes from 2, shnayim (שניים).
Tuesday is Yom Shlishi (יום שלישי) and comes from 3, shlosha (שלושה).
Wednesday is Yom Revi’i (יום רביעי) and comes from 4, arba’a (ארבעה).
Thursday is Yom Hamishi (יום חמישי) and comes from 5, hamisha (חמישה).
Friday is Yom Shishi (יום שישי) and comes from 6, shisha (שישה).
Wait! There is one exception to this rule! Shabbat (שבת) which is Saturday, the seventh and last day of the Jewish week, is not called after a number. The day to rest with your family and friends literally means “he stopped”. This terms comes from Genesis where God has stopped his work on the seventh day.