Q. Can we say prayers in a loud voice if we are teaching a new Muslim?
A. Yes, it is permissible to read prayer in a loud voice if you are teaching a non Muslim. However, if you are performing such Salaah where you are required to recite silent like Zuhr (Farz) or Asr (Farz) Salaah, or the last two rakaats of Isha (Farz) or the last rakaat of the three Farz of Magrib, then you are required to recite silently in these rakaats.
And Allah knows best.
Mufti Waseem Khan