Let's roll up our sleeves and solve this. We have 783 and we're going to multiply it by 210, essentially adding 783 to itself 210 times.
Step 1: 0 + 783 = 783
Step 2: 783 + 783 = 1566
Step 3: 1566 + 783 = 2349
Step 4: 2349 + 783 = 3132
Step 5: 3132 + 783 = 3915
Step 6: 3915 + 783 = 4698
Step 7: 4698 + 783 = 5481
Step 8: 5481 + 783 = 6264
Step 9: 6264 + 783 = 7047
Step 10: 7047 + 783 = 7830
Step 11: 7830 + 783 = 8613
Step 12: 8613 + 783 = 9396
Step 13: 9396 + 783 = 10179
Step 14: 10179 + 783 = 10962
Step 15: 10962 + 783 = 11745
Step 16: 11745 + 783 = 12528
Step 17: 12528 + 783 = 13311
Step 18: 13311 + 783 = 14094
Step 19: 14094 + 783 = 14877
Step 20: 14877 + 783 = 15660
Step 21: 15660 + 783 = 16443
Step 22: 16443 + 783 = 17226
Step 23: 17226 + 783 = 18009
Step 24: 18009 + 783 = 18792
Step 25: 18792 + 783 = 19575
Step 26: 19575 + 783 = 20358
Step 27: 20358 + 783 = 21141
Step 28: 21141 + 783 = 21924
Step 29: 21924 + 783 = 22707
Step 30: 22707 + 783 = 23490
Step 31: 23490 + 783 = 24273
Step 32: 24273 + 783 = 25056
Step 33: 25056 + 783 = 25839
Step 34: 25839 + 783 = 26622
Step 35: 26622 + 783 = 27405
Step 36: 27405 + 783 = 28188
Step 37: 28188 + 783 = 28971
Step 38: 28971 + 783 = 29754
Step 39: 29754 + 783 = 30537
Step 40: 30537 + 783 = 31320
Step 41: 31320 + 783 = 32103
Step 42: 32103 + 783 = 32886
Step 43: 32886 + 783 = 33669
Step 44: 33669 + 783 = 34452
Step 45: 34452 + 783 = 35235
Step 46: 35235 + 783 = 36018
Step 47: 36018 + 783 = 36801
Step 48: 36801 + 783 = 37584
Step 49: 37584 + 783 = 38367
Step 50: 38367 + 783 = 39150
Step 51: 39150 + 783 = 39933
Step 52: 39933 + 783 = 40716
Step 53: 40716 + 783 = 41499
Step 54: 41499 + 783 = 42282
Step 55: 42282 + 783 = 43065
Step 56: 43065 + 783 = 43848
Step 57: 43848 + 783 = 44631
Step 58: 44631 + 783 = 45414
Step 59: 45414 + 783 = 46197
Step 60: 46197 + 783 = 46980
Step 61: 46980 + 783 = 47763
Step 62: 47763 + 783 = 48546
Step 63: 48546 + 783 = 49329
Step 64: 49329 + 783 = 50112
Step 65: 50112 + 783 = 50895
Step 66: 50895 + 783 = 51678
Step 67: 51678 + 783 = 52461
Step 68: 52461 + 783 = 53244
Step 69: 53244 + 783 = 54027
Step 70: 54027 + 783 = 54810
Step 71: 54810 + 783 = 55593
Step 72: 55593 + 783 = 56376
Step 73: 56376 + 783 = 57159
Step 74: 57159 + 783 = 57942
Step 75: 57942 + 783 = 58725
Step 76: 58725 + 783 = 59508
Step 77: 59508 + 783 = 60291
Step 78: 60291 + 783 = 61074
Step 79: 61074 + 783 = 61857
Step 80: 61857 + 783 = 62640
Step 81: 62640 + 783 = 63423
Step 82: 63423 + 783 = 64206
Step 83: 64206 + 783 = 64989
Step 84: 64989 + 783 = 65772
Step 85: 65772 + 783 = 66555
Step 86: 66555 + 783 = 67338
Step 87: 67338 + 783 = 68121
Step 88: 68121 + 783 = 68904
Step 89: 68904 + 783 = 69687
Step 90: 69687 + 783 = 70470
Step 91: 70470 + 783 = 71253
Step 92: 71253 + 783 = 72036
Step 93: 72036 + 783 = 72819
Step 94: 72819 + 783 = 73602
Step 95: 73602 + 783 = 74385
Step 96: 74385 + 783 = 75168
Step 97: 75168 + 783 = 75951
Step 98: 75951 + 783 = 76734
Step 99: 76734 + 783 = 77517
Step 100: 77517 + 783 = 78300
Step 101: 78300 + 783 = 79083
Step 102: 79083 + 783 = 79866
Step 103: 79866 + 783 = 80649
Step 104: 80649 + 783 = 81432
Step 105: 81432 + 783 = 82215
Step 106: 82215 + 783 = 82998
Step 107: 82998 + 783 = 83781
Step 108: 83781 + 783 = 84564
Step 109: 84564 + 783 = 85347
Step 110: 85347 + 783 = 86130
Step 111: 86130 + 783 = 86913
Step 112: 86913 + 783 = 87696
Step 113: 87696 + 783 = 88479
Step 114: 88479 + 783 = 89262
Step 115: 89262 + 783 = 90045
Step 116: 90045 + 783 = 90828
Step 117: 90828 + 783 = 91611
Step 118: 91611 + 783 = 92394
Step 119: 92394 + 783 = 93177
Step 120: 93177 + 783 = 93960
Step 121: 93960 + 783 = 94743
Step 122: 94743 + 783 = 95526
Step 123: 95526 + 783 = 96309
Step 124: 96309 + 783 = 97092
Step 125: 97092 + 783 = 97875
Step 126: 97875 + 783 = 98658
Step 127: 98658 + 783 = 99441
Step 128: 99441 + 783 = 100224
Step 129: 100224 + 783 = 101007
Step 130: 101007 + 783 = 101790
Step 131: 101790 + 783 = 102573
Step 132: 102573 + 783 = 103356
Step 133: 103356 + 783 = 104139
Step 134: 104139 + 783 = 104922
Step 135: 104922 + 783 = 105705
Step 136: 105705 + 783 = 106488
Step 137: 106488 + 783 = 107271
Step 138: 107271 + 783 = 108054
Step 139: 108054 + 783 = 108837
Step 140: 108837 + 783 = 109620
Step 141: 109620 + 783 = 110403
Step 142: 110403 + 783 = 111186
Step 143: 111186 + 783 = 111969
Step 144: 111969 + 783 = 112752
Step 145: 112752 + 783 = 113535
Step 146: 113535 + 783 = 114318
Step 147: 114318 + 783 = 115101
Step 148: 115101 + 783 = 115884
Step 149: 115884 + 783 = 116667
Step 150: 116667 + 783 = 117450
Step 151: 117450 + 783 = 118233
Step 152: 118233 + 783 = 119016
Step 153: 119016 + 783 = 119799
Step 154: 119799 + 783 = 120582
Step 155: 120582 + 783 = 121365
Step 156: 121365 + 783 = 122148
Step 157: 122148 + 783 = 122931
Step 158: 122931 + 783 = 123714
Step 159: 123714 + 783 = 124497
Step 160: 124497 + 783 = 125280
Step 161: 125280 + 783 = 126063
Step 162: 126063 + 783 = 126846
Step 163: 126846 + 783 = 127629
Step 164: 127629 + 783 = 128412
Step 165: 128412 + 783 = 129195
Step 166: 129195 + 783 = 129978
Step 167: 129978 + 783 = 130761
Step 168: 130761 + 783 = 131544
Step 169: 131544 + 783 = 132327
Step 170: 132327 + 783 = 133110
Step 171: 133110 + 783 = 133893
Step 172: 133893 + 783 = 134676
Step 173: 134676 + 783 = 135459
Step 174: 135459 + 783 = 136242
Step 175: 136242 + 783 = 137025
Step 176: 137025 + 783 = 137808
Step 177: 137808 + 783 = 138591
Step 178: 138591 + 783 = 139374
Step 179: 139374 + 783 = 140157
Step 180: 140157 + 783 = 140940
Step 181: 140940 + 783 = 141723
Step 182: 141723 + 783 = 142506
Step 183: 142506 + 783 = 143289
Step 184: 143289 + 783 = 144072
Step 185: 144072 + 783 = 144855
Step 186: 144855 + 783 = 145638
Step 187: 145638 + 783 = 146421
Step 188: 146421 + 783 = 147204
Step 189: 147204 + 783 = 147987
Step 190: 147987 + 783 = 148770
Step 191: 148770 + 783 = 149553
Step 192: 149553 + 783 = 150336
Step 193: 150336 + 783 = 151119
Step 194: 151119 + 783 = 151902
Step 195: 151902 + 783 = 152685
Step 196: 152685 + 783 = 153468
Step 197: 153468 + 783 = 154251
Step 198: 154251 + 783 = 155034
Step 199: 155034 + 783 = 155817
Step 200: 155817 + 783 = 156600
Step 201: 156600 + 783 = 157383
Step 202: 157383 + 783 = 158166
Step 203: 158166 + 783 = 158949
Step 204: 158949 + 783 = 159732
Step 205: 159732 + 783 = 160515
Step 206: 160515 + 783 = 161298
Step 207: 161298 + 783 = 162081
Step 208: 162081 + 783 = 162864
Step 209: 162864 + 783 = 163647
Step 210: 163647 + 783 = 164430

So, 783*210 = 164430