OK, let's work through this together. We're starting with 302 and we're going to multiply it by 12, which means we add 302 to itself 12 times.
Step 1: 0 + 302 = 302
Step 2: 302 + 302 = 604
Step 3: 604 + 302 = 906
Step 4: 906 + 302 = 1208
Step 5: 1208 + 302 = 1510
Step 6: 1510 + 302 = 1812
Step 7: 1812 + 302 = 2114
Step 8: 2114 + 302 = 2416
Step 9: 2416 + 302 = 2718
Step 10: 2718 + 302 = 3020
Step 11: 3020 + 302 = 3322
Step 12: 3322 + 302 = 3624

So, 302*12 = 3624