Without delay, let's solve this. We've got 252 and we will be multiplying it by 12, that is, adding 252 to itself 12 times.
Step 1: 0 + 252 = 252
Step 2: 252 + 252 = 504
Step 3: 504 + 252 = 756
Step 4: 756 + 252 = 1008
Step 5: 1008 + 252 = 1260
Step 6: 1260 + 252 = 1512
Step 7: 1512 + 252 = 1764
Step 8: 1764 + 252 = 2016
Step 9: 2016 + 252 = 2268
Step 10: 2268 + 252 = 2520
Step 11: 2520 + 252 = 2772
Step 12: 2772 + 252 = 3024

So, 252*12 = 3024