Let's get this math done. We have 418 and we're going to multiply it by 15. This is the same as taking 418 and adding it to itself 15 times.
Step 1: 0 + 418 = 418
Step 2: 418 + 418 = 836
Step 3: 836 + 418 = 1254
Step 4: 1254 + 418 = 1672
Step 5: 1672 + 418 = 2090
Step 6: 2090 + 418 = 2508
Step 7: 2508 + 418 = 2926
Step 8: 2926 + 418 = 3344
Step 9: 3344 + 418 = 3762
Step 10: 3762 + 418 = 4180
Step 11: 4180 + 418 = 4598
Step 12: 4598 + 418 = 5016
Step 13: 5016 + 418 = 5434
Step 14: 5434 + 418 = 5852
Step 15: 5852 + 418 = 6270

So, 418*15 = 6270