Let's get this math done. We have 837 and we're going to multiply it by 103. This is the same as taking 837 and adding it to itself 103 times.
Step 1: 0 + 837 = 837
Step 2: 837 + 837 = 1674
Step 3: 1674 + 837 = 2511
Step 4: 2511 + 837 = 3348
Step 5: 3348 + 837 = 4185
Step 6: 4185 + 837 = 5022
Step 7: 5022 + 837 = 5859
Step 8: 5859 + 837 = 6696
Step 9: 6696 + 837 = 7533
Step 10: 7533 + 837 = 8370
Step 11: 8370 + 837 = 9207
Step 12: 9207 + 837 = 10044
Step 13: 10044 + 837 = 10881
Step 14: 10881 + 837 = 11718
Step 15: 11718 + 837 = 12555
Step 16: 12555 + 837 = 13392
Step 17: 13392 + 837 = 14229
Step 18: 14229 + 837 = 15066
Step 19: 15066 + 837 = 15903
Step 20: 15903 + 837 = 16740
Step 21: 16740 + 837 = 17577
Step 22: 17577 + 837 = 18414
Step 23: 18414 + 837 = 19251
Step 24: 19251 + 837 = 20088
Step 25: 20088 + 837 = 20925
Step 26: 20925 + 837 = 21762
Step 27: 21762 + 837 = 22599
Step 28: 22599 + 837 = 23436
Step 29: 23436 + 837 = 24273
Step 30: 24273 + 837 = 25110
Step 31: 25110 + 837 = 25947
Step 32: 25947 + 837 = 26784
Step 33: 26784 + 837 = 27621
Step 34: 27621 + 837 = 28458
Step 35: 28458 + 837 = 29295
Step 36: 29295 + 837 = 30132
Step 37: 30132 + 837 = 30969
Step 38: 30969 + 837 = 31806
Step 39: 31806 + 837 = 32643
Step 40: 32643 + 837 = 33480
Step 41: 33480 + 837 = 34317
Step 42: 34317 + 837 = 35154
Step 43: 35154 + 837 = 35991
Step 44: 35991 + 837 = 36828
Step 45: 36828 + 837 = 37665
Step 46: 37665 + 837 = 38502
Step 47: 38502 + 837 = 39339
Step 48: 39339 + 837 = 40176
Step 49: 40176 + 837 = 41013
Step 50: 41013 + 837 = 41850
Step 51: 41850 + 837 = 42687
Step 52: 42687 + 837 = 43524
Step 53: 43524 + 837 = 44361
Step 54: 44361 + 837 = 45198
Step 55: 45198 + 837 = 46035
Step 56: 46035 + 837 = 46872
Step 57: 46872 + 837 = 47709
Step 58: 47709 + 837 = 48546
Step 59: 48546 + 837 = 49383
Step 60: 49383 + 837 = 50220
Step 61: 50220 + 837 = 51057
Step 62: 51057 + 837 = 51894
Step 63: 51894 + 837 = 52731
Step 64: 52731 + 837 = 53568
Step 65: 53568 + 837 = 54405
Step 66: 54405 + 837 = 55242
Step 67: 55242 + 837 = 56079
Step 68: 56079 + 837 = 56916
Step 69: 56916 + 837 = 57753
Step 70: 57753 + 837 = 58590
Step 71: 58590 + 837 = 59427
Step 72: 59427 + 837 = 60264
Step 73: 60264 + 837 = 61101
Step 74: 61101 + 837 = 61938
Step 75: 61938 + 837 = 62775
Step 76: 62775 + 837 = 63612
Step 77: 63612 + 837 = 64449
Step 78: 64449 + 837 = 65286
Step 79: 65286 + 837 = 66123
Step 80: 66123 + 837 = 66960
Step 81: 66960 + 837 = 67797
Step 82: 67797 + 837 = 68634
Step 83: 68634 + 837 = 69471
Step 84: 69471 + 837 = 70308
Step 85: 70308 + 837 = 71145
Step 86: 71145 + 837 = 71982
Step 87: 71982 + 837 = 72819
Step 88: 72819 + 837 = 73656
Step 89: 73656 + 837 = 74493
Step 90: 74493 + 837 = 75330
Step 91: 75330 + 837 = 76167
Step 92: 76167 + 837 = 77004
Step 93: 77004 + 837 = 77841
Step 94: 77841 + 837 = 78678
Step 95: 78678 + 837 = 79515
Step 96: 79515 + 837 = 80352
Step 97: 80352 + 837 = 81189
Step 98: 81189 + 837 = 82026
Step 99: 82026 + 837 = 82863
Step 100: 82863 + 837 = 83700
Step 101: 83700 + 837 = 84537
Step 102: 84537 + 837 = 85374
Step 103: 85374 + 837 = 86211

So, 837*103 = 86211