ANSWER: One should only make himself hear that without annoying others. 

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ANSWER: Seperately, as these are time bound and should be recited on their prescribed times.

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ANSWER: It is Sunnah for the Muslim, when he leaves his house and heads towards the mosque, to recite the du’aa’ for walking to the masjid:  It was narrated that ‘Abd-Allaah ibn ‘Abbaas said: “… Then the muezzin gave the call to prayer, and he (the Prophet (peace and blessings of Allaah be upon him)) […]

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ANSWER: No problem, however it’s best to count on your right hand fingers as these would bear witness for you on the day of judgement.

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