No, you don’t have to make them up, but you have to pray in the right way after you have found out the correct ruling.

In the past, my parents and I combined our prayers when there was not a real need. Do we have to make up all of these prayers? I cannot exactly remember how many there were.

Prayer | October 19, 2015 3:58 am
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Dear Sheikh, does that mean that if a person does any deed like dhikr or giving sadaqah etc whilst he is not offering salah, will get no reward for his good actions?
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In the middle of two prostrations, we recite supplication, e.g. ‘Rabbighfirli Rabbighfirli’. Is it required to recite this in the middle of the two prostrations of forgetfulness? If yes, would it be considered Sunnah or Wajib? Please clarify.