Let's get this math done. We have 251 and we're going to multiply it by 135. This is the same as taking 251 and adding it to itself 135 times.
Step 1: 0 + 251 = 251
Step 2: 251 + 251 = 502
Step 3: 502 + 251 = 753
Step 4: 753 + 251 = 1004
Step 5: 1004 + 251 = 1255
Step 6: 1255 + 251 = 1506
Step 7: 1506 + 251 = 1757
Step 8: 1757 + 251 = 2008
Step 9: 2008 + 251 = 2259
Step 10: 2259 + 251 = 2510
Step 11: 2510 + 251 = 2761
Step 12: 2761 + 251 = 3012
Step 13: 3012 + 251 = 3263
Step 14: 3263 + 251 = 3514
Step 15: 3514 + 251 = 3765
Step 16: 3765 + 251 = 4016
Step 17: 4016 + 251 = 4267
Step 18: 4267 + 251 = 4518
Step 19: 4518 + 251 = 4769
Step 20: 4769 + 251 = 5020
Step 21: 5020 + 251 = 5271
Step 22: 5271 + 251 = 5522
Step 23: 5522 + 251 = 5773
Step 24: 5773 + 251 = 6024
Step 25: 6024 + 251 = 6275
Step 26: 6275 + 251 = 6526
Step 27: 6526 + 251 = 6777
Step 28: 6777 + 251 = 7028
Step 29: 7028 + 251 = 7279
Step 30: 7279 + 251 = 7530
Step 31: 7530 + 251 = 7781
Step 32: 7781 + 251 = 8032
Step 33: 8032 + 251 = 8283
Step 34: 8283 + 251 = 8534
Step 35: 8534 + 251 = 8785
Step 36: 8785 + 251 = 9036
Step 37: 9036 + 251 = 9287
Step 38: 9287 + 251 = 9538
Step 39: 9538 + 251 = 9789
Step 40: 9789 + 251 = 10040
Step 41: 10040 + 251 = 10291
Step 42: 10291 + 251 = 10542
Step 43: 10542 + 251 = 10793
Step 44: 10793 + 251 = 11044
Step 45: 11044 + 251 = 11295
Step 46: 11295 + 251 = 11546
Step 47: 11546 + 251 = 11797
Step 48: 11797 + 251 = 12048
Step 49: 12048 + 251 = 12299
Step 50: 12299 + 251 = 12550
Step 51: 12550 + 251 = 12801
Step 52: 12801 + 251 = 13052
Step 53: 13052 + 251 = 13303
Step 54: 13303 + 251 = 13554
Step 55: 13554 + 251 = 13805
Step 56: 13805 + 251 = 14056
Step 57: 14056 + 251 = 14307
Step 58: 14307 + 251 = 14558
Step 59: 14558 + 251 = 14809
Step 60: 14809 + 251 = 15060
Step 61: 15060 + 251 = 15311
Step 62: 15311 + 251 = 15562
Step 63: 15562 + 251 = 15813
Step 64: 15813 + 251 = 16064
Step 65: 16064 + 251 = 16315
Step 66: 16315 + 251 = 16566
Step 67: 16566 + 251 = 16817
Step 68: 16817 + 251 = 17068
Step 69: 17068 + 251 = 17319
Step 70: 17319 + 251 = 17570
Step 71: 17570 + 251 = 17821
Step 72: 17821 + 251 = 18072
Step 73: 18072 + 251 = 18323
Step 74: 18323 + 251 = 18574
Step 75: 18574 + 251 = 18825
Step 76: 18825 + 251 = 19076
Step 77: 19076 + 251 = 19327
Step 78: 19327 + 251 = 19578
Step 79: 19578 + 251 = 19829
Step 80: 19829 + 251 = 20080
Step 81: 20080 + 251 = 20331
Step 82: 20331 + 251 = 20582
Step 83: 20582 + 251 = 20833
Step 84: 20833 + 251 = 21084
Step 85: 21084 + 251 = 21335
Step 86: 21335 + 251 = 21586
Step 87: 21586 + 251 = 21837
Step 88: 21837 + 251 = 22088
Step 89: 22088 + 251 = 22339
Step 90: 22339 + 251 = 22590
Step 91: 22590 + 251 = 22841
Step 92: 22841 + 251 = 23092
Step 93: 23092 + 251 = 23343
Step 94: 23343 + 251 = 23594
Step 95: 23594 + 251 = 23845
Step 96: 23845 + 251 = 24096
Step 97: 24096 + 251 = 24347
Step 98: 24347 + 251 = 24598
Step 99: 24598 + 251 = 24849
Step 100: 24849 + 251 = 25100
Step 101: 25100 + 251 = 25351
Step 102: 25351 + 251 = 25602
Step 103: 25602 + 251 = 25853
Step 104: 25853 + 251 = 26104
Step 105: 26104 + 251 = 26355
Step 106: 26355 + 251 = 26606
Step 107: 26606 + 251 = 26857
Step 108: 26857 + 251 = 27108
Step 109: 27108 + 251 = 27359
Step 110: 27359 + 251 = 27610
Step 111: 27610 + 251 = 27861
Step 112: 27861 + 251 = 28112
Step 113: 28112 + 251 = 28363
Step 114: 28363 + 251 = 28614
Step 115: 28614 + 251 = 28865
Step 116: 28865 + 251 = 29116
Step 117: 29116 + 251 = 29367
Step 118: 29367 + 251 = 29618
Step 119: 29618 + 251 = 29869
Step 120: 29869 + 251 = 30120
Step 121: 30120 + 251 = 30371
Step 122: 30371 + 251 = 30622
Step 123: 30622 + 251 = 30873
Step 124: 30873 + 251 = 31124
Step 125: 31124 + 251 = 31375
Step 126: 31375 + 251 = 31626
Step 127: 31626 + 251 = 31877
Step 128: 31877 + 251 = 32128
Step 129: 32128 + 251 = 32379
Step 130: 32379 + 251 = 32630
Step 131: 32630 + 251 = 32881
Step 132: 32881 + 251 = 33132
Step 133: 33132 + 251 = 33383
Step 134: 33383 + 251 = 33634
Step 135: 33634 + 251 = 33885

So, 251*135 = 33885