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Sir... I myself don't know how to find SD frm it. I found it out while reading the functions book of the calculaor. I tried to find out but I too didnt understand it.. And don't buy it now, just a week before your exams. You'll get confused. Anyways, you have to show the working. The calculator will just provide you an extra help in checking your answers. if you are giving addmaths. Tou us mein bohat faida ho ga. Since I used the calculator to ensure 40 marks in the paper.