Question

Difference between restoring and non restoring division algorithm

Answer 1

You generally do a test subtraction for each digit step;
                      if the result is positive or zero, you note down a 1 as next digit of your quotient.
if the result is negative follow the below strategies. 
restoring method:
                      you add the divisor back,and put 0 as your next quotient digit.
non-restoring method:
                     keep negative remainder and a digit 1,and basically correct things by a supplementary addition afterwards.