OK, let's work through this together. We're starting with 849 and we're going to multiply it by 27, which means we add 849 to itself 27 times.
Step 1: 0 + 849 = 849
Step 2: 849 + 849 = 1698
Step 3: 1698 + 849 = 2547
Step 4: 2547 + 849 = 3396
Step 5: 3396 + 849 = 4245
Step 6: 4245 + 849 = 5094
Step 7: 5094 + 849 = 5943
Step 8: 5943 + 849 = 6792
Step 9: 6792 + 849 = 7641
Step 10: 7641 + 849 = 8490
Step 11: 8490 + 849 = 9339
Step 12: 9339 + 849 = 10188
Step 13: 10188 + 849 = 11037
Step 14: 11037 + 849 = 11886
Step 15: 11886 + 849 = 12735
Step 16: 12735 + 849 = 13584
Step 17: 13584 + 849 = 14433
Step 18: 14433 + 849 = 15282
Step 19: 15282 + 849 = 16131
Step 20: 16131 + 849 = 16980
Step 21: 16980 + 849 = 17829
Step 22: 17829 + 849 = 18678
Step 23: 18678 + 849 = 19527
Step 24: 19527 + 849 = 20376
Step 25: 20376 + 849 = 21225
Step 26: 21225 + 849 = 22074
Step 27: 22074 + 849 = 22923

So, 849*27 = 22923