OK, let's work through this together. We're starting with 993 and we're going to multiply it by 10, which means we add 993 to itself 10 times.
Step 1: 0 + 993 = 993
Step 2: 993 + 993 = 1986
Step 3: 1986 + 993 = 2979
Step 4: 2979 + 993 = 3972
Step 5: 3972 + 993 = 4965
Step 6: 4965 + 993 = 5958
Step 7: 5958 + 993 = 6951
Step 8: 6951 + 993 = 7944
Step 9: 7944 + 993 = 8937
Step 10: 8937 + 993 = 9930

So, 993*10 = 9930