Let's get this math done. We have 393 and we're going to multiply it by 280. This is the same as taking 393 and adding it to itself 280 times.
Step 1: 0 + 393 = 393
Step 2: 393 + 393 = 786
Step 3: 786 + 393 = 1179
Step 4: 1179 + 393 = 1572
Step 5: 1572 + 393 = 1965
Step 6: 1965 + 393 = 2358
Step 7: 2358 + 393 = 2751
Step 8: 2751 + 393 = 3144
Step 9: 3144 + 393 = 3537
Step 10: 3537 + 393 = 3930
Step 11: 3930 + 393 = 4323
Step 12: 4323 + 393 = 4716
Step 13: 4716 + 393 = 5109
Step 14: 5109 + 393 = 5502
Step 15: 5502 + 393 = 5895
Step 16: 5895 + 393 = 6288
Step 17: 6288 + 393 = 6681
Step 18: 6681 + 393 = 7074
Step 19: 7074 + 393 = 7467
Step 20: 7467 + 393 = 7860
Step 21: 7860 + 393 = 8253
Step 22: 8253 + 393 = 8646
Step 23: 8646 + 393 = 9039
Step 24: 9039 + 393 = 9432
Step 25: 9432 + 393 = 9825
Step 26: 9825 + 393 = 10218
Step 27: 10218 + 393 = 10611
Step 28: 10611 + 393 = 11004
Step 29: 11004 + 393 = 11397
Step 30: 11397 + 393 = 11790
Step 31: 11790 + 393 = 12183
Step 32: 12183 + 393 = 12576
Step 33: 12576 + 393 = 12969
Step 34: 12969 + 393 = 13362
Step 35: 13362 + 393 = 13755
Step 36: 13755 + 393 = 14148
Step 37: 14148 + 393 = 14541
Step 38: 14541 + 393 = 14934
Step 39: 14934 + 393 = 15327
Step 40: 15327 + 393 = 15720
Step 41: 15720 + 393 = 16113
Step 42: 16113 + 393 = 16506
Step 43: 16506 + 393 = 16899
Step 44: 16899 + 393 = 17292
Step 45: 17292 + 393 = 17685
Step 46: 17685 + 393 = 18078
Step 47: 18078 + 393 = 18471
Step 48: 18471 + 393 = 18864
Step 49: 18864 + 393 = 19257
Step 50: 19257 + 393 = 19650
Step 51: 19650 + 393 = 20043
Step 52: 20043 + 393 = 20436
Step 53: 20436 + 393 = 20829
Step 54: 20829 + 393 = 21222
Step 55: 21222 + 393 = 21615
Step 56: 21615 + 393 = 22008
Step 57: 22008 + 393 = 22401
Step 58: 22401 + 393 = 22794
Step 59: 22794 + 393 = 23187
Step 60: 23187 + 393 = 23580
Step 61: 23580 + 393 = 23973
Step 62: 23973 + 393 = 24366
Step 63: 24366 + 393 = 24759
Step 64: 24759 + 393 = 25152
Step 65: 25152 + 393 = 25545
Step 66: 25545 + 393 = 25938
Step 67: 25938 + 393 = 26331
Step 68: 26331 + 393 = 26724
Step 69: 26724 + 393 = 27117
Step 70: 27117 + 393 = 27510
Step 71: 27510 + 393 = 27903
Step 72: 27903 + 393 = 28296
Step 73: 28296 + 393 = 28689
Step 74: 28689 + 393 = 29082
Step 75: 29082 + 393 = 29475
Step 76: 29475 + 393 = 29868
Step 77: 29868 + 393 = 30261
Step 78: 30261 + 393 = 30654
Step 79: 30654 + 393 = 31047
Step 80: 31047 + 393 = 31440
Step 81: 31440 + 393 = 31833
Step 82: 31833 + 393 = 32226
Step 83: 32226 + 393 = 32619
Step 84: 32619 + 393 = 33012
Step 85: 33012 + 393 = 33405
Step 86: 33405 + 393 = 33798
Step 87: 33798 + 393 = 34191
Step 88: 34191 + 393 = 34584
Step 89: 34584 + 393 = 34977
Step 90: 34977 + 393 = 35370
Step 91: 35370 + 393 = 35763
Step 92: 35763 + 393 = 36156
Step 93: 36156 + 393 = 36549
Step 94: 36549 + 393 = 36942
Step 95: 36942 + 393 = 37335
Step 96: 37335 + 393 = 37728
Step 97: 37728 + 393 = 38121
Step 98: 38121 + 393 = 38514
Step 99: 38514 + 393 = 38907
Step 100: 38907 + 393 = 39300
Step 101: 39300 + 393 = 39693
Step 102: 39693 + 393 = 40086
Step 103: 40086 + 393 = 40479
Step 104: 40479 + 393 = 40872
Step 105: 40872 + 393 = 41265
Step 106: 41265 + 393 = 41658
Step 107: 41658 + 393 = 42051
Step 108: 42051 + 393 = 42444
Step 109: 42444 + 393 = 42837
Step 110: 42837 + 393 = 43230
Step 111: 43230 + 393 = 43623
Step 112: 43623 + 393 = 44016
Step 113: 44016 + 393 = 44409
Step 114: 44409 + 393 = 44802
Step 115: 44802 + 393 = 45195
Step 116: 45195 + 393 = 45588
Step 117: 45588 + 393 = 45981
Step 118: 45981 + 393 = 46374
Step 119: 46374 + 393 = 46767
Step 120: 46767 + 393 = 47160
Step 121: 47160 + 393 = 47553
Step 122: 47553 + 393 = 47946
Step 123: 47946 + 393 = 48339
Step 124: 48339 + 393 = 48732
Step 125: 48732 + 393 = 49125
Step 126: 49125 + 393 = 49518
Step 127: 49518 + 393 = 49911
Step 128: 49911 + 393 = 50304
Step 129: 50304 + 393 = 50697
Step 130: 50697 + 393 = 51090
Step 131: 51090 + 393 = 51483
Step 132: 51483 + 393 = 51876
Step 133: 51876 + 393 = 52269
Step 134: 52269 + 393 = 52662
Step 135: 52662 + 393 = 53055
Step 136: 53055 + 393 = 53448
Step 137: 53448 + 393 = 53841
Step 138: 53841 + 393 = 54234
Step 139: 54234 + 393 = 54627
Step 140: 54627 + 393 = 55020
Step 141: 55020 + 393 = 55413
Step 142: 55413 + 393 = 55806
Step 143: 55806 + 393 = 56199
Step 144: 56199 + 393 = 56592
Step 145: 56592 + 393 = 56985
Step 146: 56985 + 393 = 57378
Step 147: 57378 + 393 = 57771
Step 148: 57771 + 393 = 58164
Step 149: 58164 + 393 = 58557
Step 150: 58557 + 393 = 58950
Step 151: 58950 + 393 = 59343
Step 152: 59343 + 393 = 59736
Step 153: 59736 + 393 = 60129
Step 154: 60129 + 393 = 60522
Step 155: 60522 + 393 = 60915
Step 156: 60915 + 393 = 61308
Step 157: 61308 + 393 = 61701
Step 158: 61701 + 393 = 62094
Step 159: 62094 + 393 = 62487
Step 160: 62487 + 393 = 62880
Step 161: 62880 + 393 = 63273
Step 162: 63273 + 393 = 63666
Step 163: 63666 + 393 = 64059
Step 164: 64059 + 393 = 64452
Step 165: 64452 + 393 = 64845
Step 166: 64845 + 393 = 65238
Step 167: 65238 + 393 = 65631
Step 168: 65631 + 393 = 66024
Step 169: 66024 + 393 = 66417
Step 170: 66417 + 393 = 66810
Step 171: 66810 + 393 = 67203
Step 172: 67203 + 393 = 67596
Step 173: 67596 + 393 = 67989
Step 174: 67989 + 393 = 68382
Step 175: 68382 + 393 = 68775
Step 176: 68775 + 393 = 69168
Step 177: 69168 + 393 = 69561
Step 178: 69561 + 393 = 69954
Step 179: 69954 + 393 = 70347
Step 180: 70347 + 393 = 70740
Step 181: 70740 + 393 = 71133
Step 182: 71133 + 393 = 71526
Step 183: 71526 + 393 = 71919
Step 184: 71919 + 393 = 72312
Step 185: 72312 + 393 = 72705
Step 186: 72705 + 393 = 73098
Step 187: 73098 + 393 = 73491
Step 188: 73491 + 393 = 73884
Step 189: 73884 + 393 = 74277
Step 190: 74277 + 393 = 74670
Step 191: 74670 + 393 = 75063
Step 192: 75063 + 393 = 75456
Step 193: 75456 + 393 = 75849
Step 194: 75849 + 393 = 76242
Step 195: 76242 + 393 = 76635
Step 196: 76635 + 393 = 77028
Step 197: 77028 + 393 = 77421
Step 198: 77421 + 393 = 77814
Step 199: 77814 + 393 = 78207
Step 200: 78207 + 393 = 78600
Step 201: 78600 + 393 = 78993
Step 202: 78993 + 393 = 79386
Step 203: 79386 + 393 = 79779
Step 204: 79779 + 393 = 80172
Step 205: 80172 + 393 = 80565
Step 206: 80565 + 393 = 80958
Step 207: 80958 + 393 = 81351
Step 208: 81351 + 393 = 81744
Step 209: 81744 + 393 = 82137
Step 210: 82137 + 393 = 82530
Step 211: 82530 + 393 = 82923
Step 212: 82923 + 393 = 83316
Step 213: 83316 + 393 = 83709
Step 214: 83709 + 393 = 84102
Step 215: 84102 + 393 = 84495
Step 216: 84495 + 393 = 84888
Step 217: 84888 + 393 = 85281
Step 218: 85281 + 393 = 85674
Step 219: 85674 + 393 = 86067
Step 220: 86067 + 393 = 86460
Step 221: 86460 + 393 = 86853
Step 222: 86853 + 393 = 87246
Step 223: 87246 + 393 = 87639
Step 224: 87639 + 393 = 88032
Step 225: 88032 + 393 = 88425
Step 226: 88425 + 393 = 88818
Step 227: 88818 + 393 = 89211
Step 228: 89211 + 393 = 89604
Step 229: 89604 + 393 = 89997
Step 230: 89997 + 393 = 90390
Step 231: 90390 + 393 = 90783
Step 232: 90783 + 393 = 91176
Step 233: 91176 + 393 = 91569
Step 234: 91569 + 393 = 91962
Step 235: 91962 + 393 = 92355
Step 236: 92355 + 393 = 92748
Step 237: 92748 + 393 = 93141
Step 238: 93141 + 393 = 93534
Step 239: 93534 + 393 = 93927
Step 240: 93927 + 393 = 94320
Step 241: 94320 + 393 = 94713
Step 242: 94713 + 393 = 95106
Step 243: 95106 + 393 = 95499
Step 244: 95499 + 393 = 95892
Step 245: 95892 + 393 = 96285
Step 246: 96285 + 393 = 96678
Step 247: 96678 + 393 = 97071
Step 248: 97071 + 393 = 97464
Step 249: 97464 + 393 = 97857
Step 250: 97857 + 393 = 98250
Step 251: 98250 + 393 = 98643
Step 252: 98643 + 393 = 99036
Step 253: 99036 + 393 = 99429
Step 254: 99429 + 393 = 99822
Step 255: 99822 + 393 = 100215
Step 256: 100215 + 393 = 100608
Step 257: 100608 + 393 = 101001
Step 258: 101001 + 393 = 101394
Step 259: 101394 + 393 = 101787
Step 260: 101787 + 393 = 102180
Step 261: 102180 + 393 = 102573
Step 262: 102573 + 393 = 102966
Step 263: 102966 + 393 = 103359
Step 264: 103359 + 393 = 103752
Step 265: 103752 + 393 = 104145
Step 266: 104145 + 393 = 104538
Step 267: 104538 + 393 = 104931
Step 268: 104931 + 393 = 105324
Step 269: 105324 + 393 = 105717
Step 270: 105717 + 393 = 106110
Step 271: 106110 + 393 = 106503
Step 272: 106503 + 393 = 106896
Step 273: 106896 + 393 = 107289
Step 274: 107289 + 393 = 107682
Step 275: 107682 + 393 = 108075
Step 276: 108075 + 393 = 108468
Step 277: 108468 + 393 = 108861
Step 278: 108861 + 393 = 109254
Step 279: 109254 + 393 = 109647
Step 280: 109647 + 393 = 110040

So, 393*280 = 110040