`Abdullah bin `Umar (May Allah be pleased with them) reported: I performed along with the Prophet (PBUH) two Rak`ah (Sunnah prayer) after the Jumu'ah prayer.
[Al-Bukhari and Muslim].

1126. Abu Hurairah (May Allah be pleased with him)reported: The Messenger of Allah (PBUH) said, "If anyone of you performs the Friday prayer, he should perform four Rak`ah (Sunnah) after it.''
[Muslim].

1127. Ibn `Umar (May Allah be pleased with them) reported: The Prophet (PBUH) would not perform any Salat (in the mosque) after the Friday prayer till he had returned to his house. He would then perform two Rak`ah there.
[Muslim].

Commentary: In one Hadith, there is mention of four Rak`ah, while in the other it is mentioned as two Rak`ah. It can be deduced that both of these are acceptable. `Ulama' are of the opinion that one who performs them in the mosque, should perform four Rak`ah; whereas the one performing them at home, should perform two Rak`ah with one Taslim. It is better to perform them in twos as the Prophet (PBUH) is reported to have said, "Perform the Nawafil of the day and night in twos.'' (Al-Bukhari).