A juz' (Arabic: جزء, plural اجزاء ajza' ) literally means "part." It is one of thirty parts of roughly equal length into which the Qur'an is sometimes divided. This division facilitates recitation of the Qur'an in a month, especially during Ramadan when the entire Qur'an is recited in the Tarawihsalat; reciting approximately one juz' a night. A juz' is further divided into two ahzab (groups), and each hizb (group) is in turn subdivided into four quarters. The most commonly referred and memorized juz' is "juz' Amma'," which is the 30th juz' and contains Surahs 78 through 114, most of the shortest suras in the Qur'an; these are the suras typically read during regular prayer, and 'Amma is generally taught first to children.