OK, let's crack this. We're given 857 and our task is to multiply it by 138. Essentially, we'll be adding 857 to itself 138 times.
Step 1: 0 + 857 = 857
Step 2: 857 + 857 = 1714
Step 3: 1714 + 857 = 2571
Step 4: 2571 + 857 = 3428
Step 5: 3428 + 857 = 4285
Step 6: 4285 + 857 = 5142
Step 7: 5142 + 857 = 5999
Step 8: 5999 + 857 = 6856
Step 9: 6856 + 857 = 7713
Step 10: 7713 + 857 = 8570
Step 11: 8570 + 857 = 9427
Step 12: 9427 + 857 = 10284
Step 13: 10284 + 857 = 11141
Step 14: 11141 + 857 = 11998
Step 15: 11998 + 857 = 12855
Step 16: 12855 + 857 = 13712
Step 17: 13712 + 857 = 14569
Step 18: 14569 + 857 = 15426
Step 19: 15426 + 857 = 16283
Step 20: 16283 + 857 = 17140
Step 21: 17140 + 857 = 17997
Step 22: 17997 + 857 = 18854
Step 23: 18854 + 857 = 19711
Step 24: 19711 + 857 = 20568
Step 25: 20568 + 857 = 21425
Step 26: 21425 + 857 = 22282
Step 27: 22282 + 857 = 23139
Step 28: 23139 + 857 = 23996
Step 29: 23996 + 857 = 24853
Step 30: 24853 + 857 = 25710
Step 31: 25710 + 857 = 26567
Step 32: 26567 + 857 = 27424
Step 33: 27424 + 857 = 28281
Step 34: 28281 + 857 = 29138
Step 35: 29138 + 857 = 29995
Step 36: 29995 + 857 = 30852
Step 37: 30852 + 857 = 31709
Step 38: 31709 + 857 = 32566
Step 39: 32566 + 857 = 33423
Step 40: 33423 + 857 = 34280
Step 41: 34280 + 857 = 35137
Step 42: 35137 + 857 = 35994
Step 43: 35994 + 857 = 36851
Step 44: 36851 + 857 = 37708
Step 45: 37708 + 857 = 38565
Step 46: 38565 + 857 = 39422
Step 47: 39422 + 857 = 40279
Step 48: 40279 + 857 = 41136
Step 49: 41136 + 857 = 41993
Step 50: 41993 + 857 = 42850
Step 51: 42850 + 857 = 43707
Step 52: 43707 + 857 = 44564
Step 53: 44564 + 857 = 45421
Step 54: 45421 + 857 = 46278
Step 55: 46278 + 857 = 47135
Step 56: 47135 + 857 = 47992
Step 57: 47992 + 857 = 48849
Step 58: 48849 + 857 = 49706
Step 59: 49706 + 857 = 50563
Step 60: 50563 + 857 = 51420
Step 61: 51420 + 857 = 52277
Step 62: 52277 + 857 = 53134
Step 63: 53134 + 857 = 53991
Step 64: 53991 + 857 = 54848
Step 65: 54848 + 857 = 55705
Step 66: 55705 + 857 = 56562
Step 67: 56562 + 857 = 57419
Step 68: 57419 + 857 = 58276
Step 69: 58276 + 857 = 59133
Step 70: 59133 + 857 = 59990
Step 71: 59990 + 857 = 60847
Step 72: 60847 + 857 = 61704
Step 73: 61704 + 857 = 62561
Step 74: 62561 + 857 = 63418
Step 75: 63418 + 857 = 64275
Step 76: 64275 + 857 = 65132
Step 77: 65132 + 857 = 65989
Step 78: 65989 + 857 = 66846
Step 79: 66846 + 857 = 67703
Step 80: 67703 + 857 = 68560
Step 81: 68560 + 857 = 69417
Step 82: 69417 + 857 = 70274
Step 83: 70274 + 857 = 71131
Step 84: 71131 + 857 = 71988
Step 85: 71988 + 857 = 72845
Step 86: 72845 + 857 = 73702
Step 87: 73702 + 857 = 74559
Step 88: 74559 + 857 = 75416
Step 89: 75416 + 857 = 76273
Step 90: 76273 + 857 = 77130
Step 91: 77130 + 857 = 77987
Step 92: 77987 + 857 = 78844
Step 93: 78844 + 857 = 79701
Step 94: 79701 + 857 = 80558
Step 95: 80558 + 857 = 81415
Step 96: 81415 + 857 = 82272
Step 97: 82272 + 857 = 83129
Step 98: 83129 + 857 = 83986
Step 99: 83986 + 857 = 84843
Step 100: 84843 + 857 = 85700
Step 101: 85700 + 857 = 86557
Step 102: 86557 + 857 = 87414
Step 103: 87414 + 857 = 88271
Step 104: 88271 + 857 = 89128
Step 105: 89128 + 857 = 89985
Step 106: 89985 + 857 = 90842
Step 107: 90842 + 857 = 91699
Step 108: 91699 + 857 = 92556
Step 109: 92556 + 857 = 93413
Step 110: 93413 + 857 = 94270
Step 111: 94270 + 857 = 95127
Step 112: 95127 + 857 = 95984
Step 113: 95984 + 857 = 96841
Step 114: 96841 + 857 = 97698
Step 115: 97698 + 857 = 98555
Step 116: 98555 + 857 = 99412
Step 117: 99412 + 857 = 100269
Step 118: 100269 + 857 = 101126
Step 119: 101126 + 857 = 101983
Step 120: 101983 + 857 = 102840
Step 121: 102840 + 857 = 103697
Step 122: 103697 + 857 = 104554
Step 123: 104554 + 857 = 105411
Step 124: 105411 + 857 = 106268
Step 125: 106268 + 857 = 107125
Step 126: 107125 + 857 = 107982
Step 127: 107982 + 857 = 108839
Step 128: 108839 + 857 = 109696
Step 129: 109696 + 857 = 110553
Step 130: 110553 + 857 = 111410
Step 131: 111410 + 857 = 112267
Step 132: 112267 + 857 = 113124
Step 133: 113124 + 857 = 113981
Step 134: 113981 + 857 = 114838
Step 135: 114838 + 857 = 115695
Step 136: 115695 + 857 = 116552
Step 137: 116552 + 857 = 117409
Step 138: 117409 + 857 = 118266

So, 857*138 = 118266