Let's get this math done. We have 987 and we're going to multiply it by 251. This is the same as taking 987 and adding it to itself 251 times.
Step 1: 0 + 987 = 987
Step 2: 987 + 987 = 1974
Step 3: 1974 + 987 = 2961
Step 4: 2961 + 987 = 3948
Step 5: 3948 + 987 = 4935
Step 6: 4935 + 987 = 5922
Step 7: 5922 + 987 = 6909
Step 8: 6909 + 987 = 7896
Step 9: 7896 + 987 = 8883
Step 10: 8883 + 987 = 9870
Step 11: 9870 + 987 = 10857
Step 12: 10857 + 987 = 11844
Step 13: 11844 + 987 = 12831
Step 14: 12831 + 987 = 13818
Step 15: 13818 + 987 = 14805
Step 16: 14805 + 987 = 15792
Step 17: 15792 + 987 = 16779
Step 18: 16779 + 987 = 17766
Step 19: 17766 + 987 = 18753
Step 20: 18753 + 987 = 19740
Step 21: 19740 + 987 = 20727
Step 22: 20727 + 987 = 21714
Step 23: 21714 + 987 = 22701
Step 24: 22701 + 987 = 23688
Step 25: 23688 + 987 = 24675
Step 26: 24675 + 987 = 25662
Step 27: 25662 + 987 = 26649
Step 28: 26649 + 987 = 27636
Step 29: 27636 + 987 = 28623
Step 30: 28623 + 987 = 29610
Step 31: 29610 + 987 = 30597
Step 32: 30597 + 987 = 31584
Step 33: 31584 + 987 = 32571
Step 34: 32571 + 987 = 33558
Step 35: 33558 + 987 = 34545
Step 36: 34545 + 987 = 35532
Step 37: 35532 + 987 = 36519
Step 38: 36519 + 987 = 37506
Step 39: 37506 + 987 = 38493
Step 40: 38493 + 987 = 39480
Step 41: 39480 + 987 = 40467
Step 42: 40467 + 987 = 41454
Step 43: 41454 + 987 = 42441
Step 44: 42441 + 987 = 43428
Step 45: 43428 + 987 = 44415
Step 46: 44415 + 987 = 45402
Step 47: 45402 + 987 = 46389
Step 48: 46389 + 987 = 47376
Step 49: 47376 + 987 = 48363
Step 50: 48363 + 987 = 49350
Step 51: 49350 + 987 = 50337
Step 52: 50337 + 987 = 51324
Step 53: 51324 + 987 = 52311
Step 54: 52311 + 987 = 53298
Step 55: 53298 + 987 = 54285
Step 56: 54285 + 987 = 55272
Step 57: 55272 + 987 = 56259
Step 58: 56259 + 987 = 57246
Step 59: 57246 + 987 = 58233
Step 60: 58233 + 987 = 59220
Step 61: 59220 + 987 = 60207
Step 62: 60207 + 987 = 61194
Step 63: 61194 + 987 = 62181
Step 64: 62181 + 987 = 63168
Step 65: 63168 + 987 = 64155
Step 66: 64155 + 987 = 65142
Step 67: 65142 + 987 = 66129
Step 68: 66129 + 987 = 67116
Step 69: 67116 + 987 = 68103
Step 70: 68103 + 987 = 69090
Step 71: 69090 + 987 = 70077
Step 72: 70077 + 987 = 71064
Step 73: 71064 + 987 = 72051
Step 74: 72051 + 987 = 73038
Step 75: 73038 + 987 = 74025
Step 76: 74025 + 987 = 75012
Step 77: 75012 + 987 = 75999
Step 78: 75999 + 987 = 76986
Step 79: 76986 + 987 = 77973
Step 80: 77973 + 987 = 78960
Step 81: 78960 + 987 = 79947
Step 82: 79947 + 987 = 80934
Step 83: 80934 + 987 = 81921
Step 84: 81921 + 987 = 82908
Step 85: 82908 + 987 = 83895
Step 86: 83895 + 987 = 84882
Step 87: 84882 + 987 = 85869
Step 88: 85869 + 987 = 86856
Step 89: 86856 + 987 = 87843
Step 90: 87843 + 987 = 88830
Step 91: 88830 + 987 = 89817
Step 92: 89817 + 987 = 90804
Step 93: 90804 + 987 = 91791
Step 94: 91791 + 987 = 92778
Step 95: 92778 + 987 = 93765
Step 96: 93765 + 987 = 94752
Step 97: 94752 + 987 = 95739
Step 98: 95739 + 987 = 96726
Step 99: 96726 + 987 = 97713
Step 100: 97713 + 987 = 98700
Step 101: 98700 + 987 = 99687
Step 102: 99687 + 987 = 100674
Step 103: 100674 + 987 = 101661
Step 104: 101661 + 987 = 102648
Step 105: 102648 + 987 = 103635
Step 106: 103635 + 987 = 104622
Step 107: 104622 + 987 = 105609
Step 108: 105609 + 987 = 106596
Step 109: 106596 + 987 = 107583
Step 110: 107583 + 987 = 108570
Step 111: 108570 + 987 = 109557
Step 112: 109557 + 987 = 110544
Step 113: 110544 + 987 = 111531
Step 114: 111531 + 987 = 112518
Step 115: 112518 + 987 = 113505
Step 116: 113505 + 987 = 114492
Step 117: 114492 + 987 = 115479
Step 118: 115479 + 987 = 116466
Step 119: 116466 + 987 = 117453
Step 120: 117453 + 987 = 118440
Step 121: 118440 + 987 = 119427
Step 122: 119427 + 987 = 120414
Step 123: 120414 + 987 = 121401
Step 124: 121401 + 987 = 122388
Step 125: 122388 + 987 = 123375
Step 126: 123375 + 987 = 124362
Step 127: 124362 + 987 = 125349
Step 128: 125349 + 987 = 126336
Step 129: 126336 + 987 = 127323
Step 130: 127323 + 987 = 128310
Step 131: 128310 + 987 = 129297
Step 132: 129297 + 987 = 130284
Step 133: 130284 + 987 = 131271
Step 134: 131271 + 987 = 132258
Step 135: 132258 + 987 = 133245
Step 136: 133245 + 987 = 134232
Step 137: 134232 + 987 = 135219
Step 138: 135219 + 987 = 136206
Step 139: 136206 + 987 = 137193
Step 140: 137193 + 987 = 138180
Step 141: 138180 + 987 = 139167
Step 142: 139167 + 987 = 140154
Step 143: 140154 + 987 = 141141
Step 144: 141141 + 987 = 142128
Step 145: 142128 + 987 = 143115
Step 146: 143115 + 987 = 144102
Step 147: 144102 + 987 = 145089
Step 148: 145089 + 987 = 146076
Step 149: 146076 + 987 = 147063
Step 150: 147063 + 987 = 148050
Step 151: 148050 + 987 = 149037
Step 152: 149037 + 987 = 150024
Step 153: 150024 + 987 = 151011
Step 154: 151011 + 987 = 151998
Step 155: 151998 + 987 = 152985
Step 156: 152985 + 987 = 153972
Step 157: 153972 + 987 = 154959
Step 158: 154959 + 987 = 155946
Step 159: 155946 + 987 = 156933
Step 160: 156933 + 987 = 157920
Step 161: 157920 + 987 = 158907
Step 162: 158907 + 987 = 159894
Step 163: 159894 + 987 = 160881
Step 164: 160881 + 987 = 161868
Step 165: 161868 + 987 = 162855
Step 166: 162855 + 987 = 163842
Step 167: 163842 + 987 = 164829
Step 168: 164829 + 987 = 165816
Step 169: 165816 + 987 = 166803
Step 170: 166803 + 987 = 167790
Step 171: 167790 + 987 = 168777
Step 172: 168777 + 987 = 169764
Step 173: 169764 + 987 = 170751
Step 174: 170751 + 987 = 171738
Step 175: 171738 + 987 = 172725
Step 176: 172725 + 987 = 173712
Step 177: 173712 + 987 = 174699
Step 178: 174699 + 987 = 175686
Step 179: 175686 + 987 = 176673
Step 180: 176673 + 987 = 177660
Step 181: 177660 + 987 = 178647
Step 182: 178647 + 987 = 179634
Step 183: 179634 + 987 = 180621
Step 184: 180621 + 987 = 181608
Step 185: 181608 + 987 = 182595
Step 186: 182595 + 987 = 183582
Step 187: 183582 + 987 = 184569
Step 188: 184569 + 987 = 185556
Step 189: 185556 + 987 = 186543
Step 190: 186543 + 987 = 187530
Step 191: 187530 + 987 = 188517
Step 192: 188517 + 987 = 189504
Step 193: 189504 + 987 = 190491
Step 194: 190491 + 987 = 191478
Step 195: 191478 + 987 = 192465
Step 196: 192465 + 987 = 193452
Step 197: 193452 + 987 = 194439
Step 198: 194439 + 987 = 195426
Step 199: 195426 + 987 = 196413
Step 200: 196413 + 987 = 197400
Step 201: 197400 + 987 = 198387
Step 202: 198387 + 987 = 199374
Step 203: 199374 + 987 = 200361
Step 204: 200361 + 987 = 201348
Step 205: 201348 + 987 = 202335
Step 206: 202335 + 987 = 203322
Step 207: 203322 + 987 = 204309
Step 208: 204309 + 987 = 205296
Step 209: 205296 + 987 = 206283
Step 210: 206283 + 987 = 207270
Step 211: 207270 + 987 = 208257
Step 212: 208257 + 987 = 209244
Step 213: 209244 + 987 = 210231
Step 214: 210231 + 987 = 211218
Step 215: 211218 + 987 = 212205
Step 216: 212205 + 987 = 213192
Step 217: 213192 + 987 = 214179
Step 218: 214179 + 987 = 215166
Step 219: 215166 + 987 = 216153
Step 220: 216153 + 987 = 217140
Step 221: 217140 + 987 = 218127
Step 222: 218127 + 987 = 219114
Step 223: 219114 + 987 = 220101
Step 224: 220101 + 987 = 221088
Step 225: 221088 + 987 = 222075
Step 226: 222075 + 987 = 223062
Step 227: 223062 + 987 = 224049
Step 228: 224049 + 987 = 225036
Step 229: 225036 + 987 = 226023
Step 230: 226023 + 987 = 227010
Step 231: 227010 + 987 = 227997
Step 232: 227997 + 987 = 228984
Step 233: 228984 + 987 = 229971
Step 234: 229971 + 987 = 230958
Step 235: 230958 + 987 = 231945
Step 236: 231945 + 987 = 232932
Step 237: 232932 + 987 = 233919
Step 238: 233919 + 987 = 234906
Step 239: 234906 + 987 = 235893
Step 240: 235893 + 987 = 236880
Step 241: 236880 + 987 = 237867
Step 242: 237867 + 987 = 238854
Step 243: 238854 + 987 = 239841
Step 244: 239841 + 987 = 240828
Step 245: 240828 + 987 = 241815
Step 246: 241815 + 987 = 242802
Step 247: 242802 + 987 = 243789
Step 248: 243789 + 987 = 244776
Step 249: 244776 + 987 = 245763
Step 250: 245763 + 987 = 246750
Step 251: 246750 + 987 = 247737

So, 987*251 = 247737