OK, let's crack this. We're given 485 and our task is to multiply it by 12. Essentially, we'll be adding 485 to itself 12 times.
Step 1: 0 + 485 = 485
Step 2: 485 + 485 = 970
Step 3: 970 + 485 = 1455
Step 4: 1455 + 485 = 1940
Step 5: 1940 + 485 = 2425
Step 6: 2425 + 485 = 2910
Step 7: 2910 + 485 = 3395
Step 8: 3395 + 485 = 3880
Step 9: 3880 + 485 = 4365
Step 10: 4365 + 485 = 4850
Step 11: 4850 + 485 = 5335
Step 12: 5335 + 485 = 5820

So, 485*12 = 5820