We have that there is 12/5 left, and we need to know how many 3/10 pieces can be made from the leftover.
To know the answer, we need to divide the fraction 12/5 by 3/10 to know this quantity. Then, we have:
We can check this answer if we sum the 3/10 pieces eight times:
Therefore, we can make 8 pieces of 3/10 from the leftover pizza (8 pieces.)