Sure thing, let's get straight to it. We start with 813 and we're going to multiply it by 6, which means adding 813 to itself 6 times.
Step 1: 0 + 813 = 813
Step 2: 813 + 813 = 1626
Step 3: 1626 + 813 = 2439
Step 4: 2439 + 813 = 3252
Step 5: 3252 + 813 = 4065
Step 6: 4065 + 813 = 4878

So, 813*6 = 4878