sajda-e-sahw

Q: If a person left out a portion of tashahud (At-Tahiyyat) in Salaah, does he have to make Sajdah-e-Sahw? 

Q: If due to some disturbance, a person missed an Aayah in Surah ​Faatihah, does he have to make Sajdah-e-Sahw? 

Q: While offering zuhr prayer alone, I mistakenly started to recite surah al faatihah in the rukoo. Should I have offered Sejdah sahw?

Q: Sometimes, I lose focus during Salaah for over 10 seconds wherein I remain silent and do not recite qiraat. When this happens, I silently think about worldly matters. I don’t do this on purpose. It just happens and takes a while for me to realize that I should focus on Salaah. Does this invalidate the Salaah?

Q: I made a mistake in one of the prayers but forgot to do sajdah sahw and got up. Later I remembered and then repeated the prayer. Should I perform sajdah sahw in the repeated prayer? 

Q: If I completed my salah and forgot to do sajda sahw, how to do it after salah? After salam if I sit and recite attahiyaat and say salam on the right side and do two sajdah and say salam to both sides. Is it the correct way? 

Q: If a muqtadi performs sajda-e-sahw without turning his head to the right and saying salaam, will the salaah be valid or should he repeat it?

Q: When sajda-e-sahw is to be done, the procedure is that it will be performed in the last qa'dah, i.e. after tashahhud, one salam to right and then 2 sujood. Sometimes due to carelessness I recite part of durood after tashahhud and then realize that I have to do sajda-e-sahw then what should I do at that moment? Should I proceed to sajda-e-sahw at that moment?

Q: I was praying Asr Salaah with Jamaat and had missed 3 rakats. I forgot to recite a surah in the second rakah, so I recited a surah in the third rakah, and also did sajdah sahw. Is this correct?

Q: I missed reciting the qiraat after Surah Faatihah in one rakaat of my esha salaah and I performed sajdah-e-sahw. Is sajdah-e-sahw sufficient or do I have to repeat the salaah?