OK, let's work through this together. We're starting with 502 and we're going to multiply it by 12, which means we add 502 to itself 12 times.
Step 1: 0 + 502 = 502
Step 2: 502 + 502 = 1004
Step 3: 1004 + 502 = 1506
Step 4: 1506 + 502 = 2008
Step 5: 2008 + 502 = 2510
Step 6: 2510 + 502 = 3012
Step 7: 3012 + 502 = 3514
Step 8: 3514 + 502 = 4016
Step 9: 4016 + 502 = 4518
Step 10: 4518 + 502 = 5020
Step 11: 5020 + 502 = 5522
Step 12: 5522 + 502 = 6024

So, 502*12 = 6024