Without delay, let's solve this. We've got 231 and we will be multiplying it by 55, that is, adding 231 to itself 55 times.
Step 1: 0 + 231 = 231
Step 2: 231 + 231 = 462
Step 3: 462 + 231 = 693
Step 4: 693 + 231 = 924
Step 5: 924 + 231 = 1155
Step 6: 1155 + 231 = 1386
Step 7: 1386 + 231 = 1617
Step 8: 1617 + 231 = 1848
Step 9: 1848 + 231 = 2079
Step 10: 2079 + 231 = 2310
Step 11: 2310 + 231 = 2541
Step 12: 2541 + 231 = 2772
Step 13: 2772 + 231 = 3003
Step 14: 3003 + 231 = 3234
Step 15: 3234 + 231 = 3465
Step 16: 3465 + 231 = 3696
Step 17: 3696 + 231 = 3927
Step 18: 3927 + 231 = 4158
Step 19: 4158 + 231 = 4389
Step 20: 4389 + 231 = 4620
Step 21: 4620 + 231 = 4851
Step 22: 4851 + 231 = 5082
Step 23: 5082 + 231 = 5313
Step 24: 5313 + 231 = 5544
Step 25: 5544 + 231 = 5775
Step 26: 5775 + 231 = 6006
Step 27: 6006 + 231 = 6237
Step 28: 6237 + 231 = 6468
Step 29: 6468 + 231 = 6699
Step 30: 6699 + 231 = 6930
Step 31: 6930 + 231 = 7161
Step 32: 7161 + 231 = 7392
Step 33: 7392 + 231 = 7623
Step 34: 7623 + 231 = 7854
Step 35: 7854 + 231 = 8085
Step 36: 8085 + 231 = 8316
Step 37: 8316 + 231 = 8547
Step 38: 8547 + 231 = 8778
Step 39: 8778 + 231 = 9009
Step 40: 9009 + 231 = 9240
Step 41: 9240 + 231 = 9471
Step 42: 9471 + 231 = 9702
Step 43: 9702 + 231 = 9933
Step 44: 9933 + 231 = 10164
Step 45: 10164 + 231 = 10395
Step 46: 10395 + 231 = 10626
Step 47: 10626 + 231 = 10857
Step 48: 10857 + 231 = 11088
Step 49: 11088 + 231 = 11319
Step 50: 11319 + 231 = 11550
Step 51: 11550 + 231 = 11781
Step 52: 11781 + 231 = 12012
Step 53: 12012 + 231 = 12243
Step 54: 12243 + 231 = 12474
Step 55: 12474 + 231 = 12705

So, 231*55 = 12705