Without delay, let's solve this. We've got 391 and we will be multiplying it by 27, that is, adding 391 to itself 27 times.
Step 1: 0 + 391 = 391
Step 2: 391 + 391 = 782
Step 3: 782 + 391 = 1173
Step 4: 1173 + 391 = 1564
Step 5: 1564 + 391 = 1955
Step 6: 1955 + 391 = 2346
Step 7: 2346 + 391 = 2737
Step 8: 2737 + 391 = 3128
Step 9: 3128 + 391 = 3519
Step 10: 3519 + 391 = 3910
Step 11: 3910 + 391 = 4301
Step 12: 4301 + 391 = 4692
Step 13: 4692 + 391 = 5083
Step 14: 5083 + 391 = 5474
Step 15: 5474 + 391 = 5865
Step 16: 5865 + 391 = 6256
Step 17: 6256 + 391 = 6647
Step 18: 6647 + 391 = 7038
Step 19: 7038 + 391 = 7429
Step 20: 7429 + 391 = 7820
Step 21: 7820 + 391 = 8211
Step 22: 8211 + 391 = 8602
Step 23: 8602 + 391 = 8993
Step 24: 8993 + 391 = 9384
Step 25: 9384 + 391 = 9775
Step 26: 9775 + 391 = 10166
Step 27: 10166 + 391 = 10557

So, 391*27 = 10557