Without delay, let's solve this. We've got 884 and we will be multiplying it by 15, that is, adding 884 to itself 15 times.
Step 1: 0 + 884 = 884
Step 2: 884 + 884 = 1768
Step 3: 1768 + 884 = 2652
Step 4: 2652 + 884 = 3536
Step 5: 3536 + 884 = 4420
Step 6: 4420 + 884 = 5304
Step 7: 5304 + 884 = 6188
Step 8: 6188 + 884 = 7072
Step 9: 7072 + 884 = 7956
Step 10: 7956 + 884 = 8840
Step 11: 8840 + 884 = 9724
Step 12: 9724 + 884 = 10608
Step 13: 10608 + 884 = 11492
Step 14: 11492 + 884 = 12376
Step 15: 12376 + 884 = 13260

So, 884*15 = 13260