OK, let's work through this together. We're starting with 756 and we're going to multiply it by 187, which means we add 756 to itself 187 times.
Step 1: 0 + 756 = 756
Step 2: 756 + 756 = 1512
Step 3: 1512 + 756 = 2268
Step 4: 2268 + 756 = 3024
Step 5: 3024 + 756 = 3780
Step 6: 3780 + 756 = 4536
Step 7: 4536 + 756 = 5292
Step 8: 5292 + 756 = 6048
Step 9: 6048 + 756 = 6804
Step 10: 6804 + 756 = 7560
Step 11: 7560 + 756 = 8316
Step 12: 8316 + 756 = 9072
Step 13: 9072 + 756 = 9828
Step 14: 9828 + 756 = 10584
Step 15: 10584 + 756 = 11340
Step 16: 11340 + 756 = 12096
Step 17: 12096 + 756 = 12852
Step 18: 12852 + 756 = 13608
Step 19: 13608 + 756 = 14364
Step 20: 14364 + 756 = 15120
Step 21: 15120 + 756 = 15876
Step 22: 15876 + 756 = 16632
Step 23: 16632 + 756 = 17388
Step 24: 17388 + 756 = 18144
Step 25: 18144 + 756 = 18900
Step 26: 18900 + 756 = 19656
Step 27: 19656 + 756 = 20412
Step 28: 20412 + 756 = 21168
Step 29: 21168 + 756 = 21924
Step 30: 21924 + 756 = 22680
Step 31: 22680 + 756 = 23436
Step 32: 23436 + 756 = 24192
Step 33: 24192 + 756 = 24948
Step 34: 24948 + 756 = 25704
Step 35: 25704 + 756 = 26460
Step 36: 26460 + 756 = 27216
Step 37: 27216 + 756 = 27972
Step 38: 27972 + 756 = 28728
Step 39: 28728 + 756 = 29484
Step 40: 29484 + 756 = 30240
Step 41: 30240 + 756 = 30996
Step 42: 30996 + 756 = 31752
Step 43: 31752 + 756 = 32508
Step 44: 32508 + 756 = 33264
Step 45: 33264 + 756 = 34020
Step 46: 34020 + 756 = 34776
Step 47: 34776 + 756 = 35532
Step 48: 35532 + 756 = 36288
Step 49: 36288 + 756 = 37044
Step 50: 37044 + 756 = 37800
Step 51: 37800 + 756 = 38556
Step 52: 38556 + 756 = 39312
Step 53: 39312 + 756 = 40068
Step 54: 40068 + 756 = 40824
Step 55: 40824 + 756 = 41580
Step 56: 41580 + 756 = 42336
Step 57: 42336 + 756 = 43092
Step 58: 43092 + 756 = 43848
Step 59: 43848 + 756 = 44604
Step 60: 44604 + 756 = 45360
Step 61: 45360 + 756 = 46116
Step 62: 46116 + 756 = 46872
Step 63: 46872 + 756 = 47628
Step 64: 47628 + 756 = 48384
Step 65: 48384 + 756 = 49140
Step 66: 49140 + 756 = 49896
Step 67: 49896 + 756 = 50652
Step 68: 50652 + 756 = 51408
Step 69: 51408 + 756 = 52164
Step 70: 52164 + 756 = 52920
Step 71: 52920 + 756 = 53676
Step 72: 53676 + 756 = 54432
Step 73: 54432 + 756 = 55188
Step 74: 55188 + 756 = 55944
Step 75: 55944 + 756 = 56700
Step 76: 56700 + 756 = 57456
Step 77: 57456 + 756 = 58212
Step 78: 58212 + 756 = 58968
Step 79: 58968 + 756 = 59724
Step 80: 59724 + 756 = 60480
Step 81: 60480 + 756 = 61236
Step 82: 61236 + 756 = 61992
Step 83: 61992 + 756 = 62748
Step 84: 62748 + 756 = 63504
Step 85: 63504 + 756 = 64260
Step 86: 64260 + 756 = 65016
Step 87: 65016 + 756 = 65772
Step 88: 65772 + 756 = 66528
Step 89: 66528 + 756 = 67284
Step 90: 67284 + 756 = 68040
Step 91: 68040 + 756 = 68796
Step 92: 68796 + 756 = 69552
Step 93: 69552 + 756 = 70308
Step 94: 70308 + 756 = 71064
Step 95: 71064 + 756 = 71820
Step 96: 71820 + 756 = 72576
Step 97: 72576 + 756 = 73332
Step 98: 73332 + 756 = 74088
Step 99: 74088 + 756 = 74844
Step 100: 74844 + 756 = 75600
Step 101: 75600 + 756 = 76356
Step 102: 76356 + 756 = 77112
Step 103: 77112 + 756 = 77868
Step 104: 77868 + 756 = 78624
Step 105: 78624 + 756 = 79380
Step 106: 79380 + 756 = 80136
Step 107: 80136 + 756 = 80892
Step 108: 80892 + 756 = 81648
Step 109: 81648 + 756 = 82404
Step 110: 82404 + 756 = 83160
Step 111: 83160 + 756 = 83916
Step 112: 83916 + 756 = 84672
Step 113: 84672 + 756 = 85428
Step 114: 85428 + 756 = 86184
Step 115: 86184 + 756 = 86940
Step 116: 86940 + 756 = 87696
Step 117: 87696 + 756 = 88452
Step 118: 88452 + 756 = 89208
Step 119: 89208 + 756 = 89964
Step 120: 89964 + 756 = 90720
Step 121: 90720 + 756 = 91476
Step 122: 91476 + 756 = 92232
Step 123: 92232 + 756 = 92988
Step 124: 92988 + 756 = 93744
Step 125: 93744 + 756 = 94500
Step 126: 94500 + 756 = 95256
Step 127: 95256 + 756 = 96012
Step 128: 96012 + 756 = 96768
Step 129: 96768 + 756 = 97524
Step 130: 97524 + 756 = 98280
Step 131: 98280 + 756 = 99036
Step 132: 99036 + 756 = 99792
Step 133: 99792 + 756 = 100548
Step 134: 100548 + 756 = 101304
Step 135: 101304 + 756 = 102060
Step 136: 102060 + 756 = 102816
Step 137: 102816 + 756 = 103572
Step 138: 103572 + 756 = 104328
Step 139: 104328 + 756 = 105084
Step 140: 105084 + 756 = 105840
Step 141: 105840 + 756 = 106596
Step 142: 106596 + 756 = 107352
Step 143: 107352 + 756 = 108108
Step 144: 108108 + 756 = 108864
Step 145: 108864 + 756 = 109620
Step 146: 109620 + 756 = 110376
Step 147: 110376 + 756 = 111132
Step 148: 111132 + 756 = 111888
Step 149: 111888 + 756 = 112644
Step 150: 112644 + 756 = 113400
Step 151: 113400 + 756 = 114156
Step 152: 114156 + 756 = 114912
Step 153: 114912 + 756 = 115668
Step 154: 115668 + 756 = 116424
Step 155: 116424 + 756 = 117180
Step 156: 117180 + 756 = 117936
Step 157: 117936 + 756 = 118692
Step 158: 118692 + 756 = 119448
Step 159: 119448 + 756 = 120204
Step 160: 120204 + 756 = 120960
Step 161: 120960 + 756 = 121716
Step 162: 121716 + 756 = 122472
Step 163: 122472 + 756 = 123228
Step 164: 123228 + 756 = 123984
Step 165: 123984 + 756 = 124740
Step 166: 124740 + 756 = 125496
Step 167: 125496 + 756 = 126252
Step 168: 126252 + 756 = 127008
Step 169: 127008 + 756 = 127764
Step 170: 127764 + 756 = 128520
Step 171: 128520 + 756 = 129276
Step 172: 129276 + 756 = 130032
Step 173: 130032 + 756 = 130788
Step 174: 130788 + 756 = 131544
Step 175: 131544 + 756 = 132300
Step 176: 132300 + 756 = 133056
Step 177: 133056 + 756 = 133812
Step 178: 133812 + 756 = 134568
Step 179: 134568 + 756 = 135324
Step 180: 135324 + 756 = 136080
Step 181: 136080 + 756 = 136836
Step 182: 136836 + 756 = 137592
Step 183: 137592 + 756 = 138348
Step 184: 138348 + 756 = 139104
Step 185: 139104 + 756 = 139860
Step 186: 139860 + 756 = 140616
Step 187: 140616 + 756 = 141372

So, 756*187 = 141372