Alright, let's solve this math problem step by step. First, we have the number 221. Next, we see the multiplication sign, which means we need to multiply something. And what are we multiplying it by? We multiply it by 15. So, we're going to take the number 221 and add it to itself 15 times.
Step 1: 0 + 221 = 221
Step 2: 221 + 221 = 442
Step 3: 442 + 221 = 663
Step 4: 663 + 221 = 884
Step 5: 884 + 221 = 1105
Step 6: 1105 + 221 = 1326
Step 7: 1326 + 221 = 1547
Step 8: 1547 + 221 = 1768
Step 9: 1768 + 221 = 1989
Step 10: 1989 + 221 = 2210
Step 11: 2210 + 221 = 2431
Step 12: 2431 + 221 = 2652
Step 13: 2652 + 221 = 2873
Step 14: 2873 + 221 = 3094
Step 15: 3094 + 221 = 3315

So, 221*15 = 3315