Alright, let's solve this math problem step by step. First, we have the number 421. Next, we see the multiplication sign, which means we need to multiply something. And what are we multiplying it by? We multiply it by 280. So, we're going to take the number 421 and add it to itself 280 times.
Step 1: 0 + 421 = 421
Step 2: 421 + 421 = 842
Step 3: 842 + 421 = 1263
Step 4: 1263 + 421 = 1684
Step 5: 1684 + 421 = 2105
Step 6: 2105 + 421 = 2526
Step 7: 2526 + 421 = 2947
Step 8: 2947 + 421 = 3368
Step 9: 3368 + 421 = 3789
Step 10: 3789 + 421 = 4210
Step 11: 4210 + 421 = 4631
Step 12: 4631 + 421 = 5052
Step 13: 5052 + 421 = 5473
Step 14: 5473 + 421 = 5894
Step 15: 5894 + 421 = 6315
Step 16: 6315 + 421 = 6736
Step 17: 6736 + 421 = 7157
Step 18: 7157 + 421 = 7578
Step 19: 7578 + 421 = 7999
Step 20: 7999 + 421 = 8420
Step 21: 8420 + 421 = 8841
Step 22: 8841 + 421 = 9262
Step 23: 9262 + 421 = 9683
Step 24: 9683 + 421 = 10104
Step 25: 10104 + 421 = 10525
Step 26: 10525 + 421 = 10946
Step 27: 10946 + 421 = 11367
Step 28: 11367 + 421 = 11788
Step 29: 11788 + 421 = 12209
Step 30: 12209 + 421 = 12630
Step 31: 12630 + 421 = 13051
Step 32: 13051 + 421 = 13472
Step 33: 13472 + 421 = 13893
Step 34: 13893 + 421 = 14314
Step 35: 14314 + 421 = 14735
Step 36: 14735 + 421 = 15156
Step 37: 15156 + 421 = 15577
Step 38: 15577 + 421 = 15998
Step 39: 15998 + 421 = 16419
Step 40: 16419 + 421 = 16840
Step 41: 16840 + 421 = 17261
Step 42: 17261 + 421 = 17682
Step 43: 17682 + 421 = 18103
Step 44: 18103 + 421 = 18524
Step 45: 18524 + 421 = 18945
Step 46: 18945 + 421 = 19366
Step 47: 19366 + 421 = 19787
Step 48: 19787 + 421 = 20208
Step 49: 20208 + 421 = 20629
Step 50: 20629 + 421 = 21050
Step 51: 21050 + 421 = 21471
Step 52: 21471 + 421 = 21892
Step 53: 21892 + 421 = 22313
Step 54: 22313 + 421 = 22734
Step 55: 22734 + 421 = 23155
Step 56: 23155 + 421 = 23576
Step 57: 23576 + 421 = 23997
Step 58: 23997 + 421 = 24418
Step 59: 24418 + 421 = 24839
Step 60: 24839 + 421 = 25260
Step 61: 25260 + 421 = 25681
Step 62: 25681 + 421 = 26102
Step 63: 26102 + 421 = 26523
Step 64: 26523 + 421 = 26944
Step 65: 26944 + 421 = 27365
Step 66: 27365 + 421 = 27786
Step 67: 27786 + 421 = 28207
Step 68: 28207 + 421 = 28628
Step 69: 28628 + 421 = 29049
Step 70: 29049 + 421 = 29470
Step 71: 29470 + 421 = 29891
Step 72: 29891 + 421 = 30312
Step 73: 30312 + 421 = 30733
Step 74: 30733 + 421 = 31154
Step 75: 31154 + 421 = 31575
Step 76: 31575 + 421 = 31996
Step 77: 31996 + 421 = 32417
Step 78: 32417 + 421 = 32838
Step 79: 32838 + 421 = 33259
Step 80: 33259 + 421 = 33680
Step 81: 33680 + 421 = 34101
Step 82: 34101 + 421 = 34522
Step 83: 34522 + 421 = 34943
Step 84: 34943 + 421 = 35364
Step 85: 35364 + 421 = 35785
Step 86: 35785 + 421 = 36206
Step 87: 36206 + 421 = 36627
Step 88: 36627 + 421 = 37048
Step 89: 37048 + 421 = 37469
Step 90: 37469 + 421 = 37890
Step 91: 37890 + 421 = 38311
Step 92: 38311 + 421 = 38732
Step 93: 38732 + 421 = 39153
Step 94: 39153 + 421 = 39574
Step 95: 39574 + 421 = 39995
Step 96: 39995 + 421 = 40416
Step 97: 40416 + 421 = 40837
Step 98: 40837 + 421 = 41258
Step 99: 41258 + 421 = 41679
Step 100: 41679 + 421 = 42100
Step 101: 42100 + 421 = 42521
Step 102: 42521 + 421 = 42942
Step 103: 42942 + 421 = 43363
Step 104: 43363 + 421 = 43784
Step 105: 43784 + 421 = 44205
Step 106: 44205 + 421 = 44626
Step 107: 44626 + 421 = 45047
Step 108: 45047 + 421 = 45468
Step 109: 45468 + 421 = 45889
Step 110: 45889 + 421 = 46310
Step 111: 46310 + 421 = 46731
Step 112: 46731 + 421 = 47152
Step 113: 47152 + 421 = 47573
Step 114: 47573 + 421 = 47994
Step 115: 47994 + 421 = 48415
Step 116: 48415 + 421 = 48836
Step 117: 48836 + 421 = 49257
Step 118: 49257 + 421 = 49678
Step 119: 49678 + 421 = 50099
Step 120: 50099 + 421 = 50520
Step 121: 50520 + 421 = 50941
Step 122: 50941 + 421 = 51362
Step 123: 51362 + 421 = 51783
Step 124: 51783 + 421 = 52204
Step 125: 52204 + 421 = 52625
Step 126: 52625 + 421 = 53046
Step 127: 53046 + 421 = 53467
Step 128: 53467 + 421 = 53888
Step 129: 53888 + 421 = 54309
Step 130: 54309 + 421 = 54730
Step 131: 54730 + 421 = 55151
Step 132: 55151 + 421 = 55572
Step 133: 55572 + 421 = 55993
Step 134: 55993 + 421 = 56414
Step 135: 56414 + 421 = 56835
Step 136: 56835 + 421 = 57256
Step 137: 57256 + 421 = 57677
Step 138: 57677 + 421 = 58098
Step 139: 58098 + 421 = 58519
Step 140: 58519 + 421 = 58940
Step 141: 58940 + 421 = 59361
Step 142: 59361 + 421 = 59782
Step 143: 59782 + 421 = 60203
Step 144: 60203 + 421 = 60624
Step 145: 60624 + 421 = 61045
Step 146: 61045 + 421 = 61466
Step 147: 61466 + 421 = 61887
Step 148: 61887 + 421 = 62308
Step 149: 62308 + 421 = 62729
Step 150: 62729 + 421 = 63150
Step 151: 63150 + 421 = 63571
Step 152: 63571 + 421 = 63992
Step 153: 63992 + 421 = 64413
Step 154: 64413 + 421 = 64834
Step 155: 64834 + 421 = 65255
Step 156: 65255 + 421 = 65676
Step 157: 65676 + 421 = 66097
Step 158: 66097 + 421 = 66518
Step 159: 66518 + 421 = 66939
Step 160: 66939 + 421 = 67360
Step 161: 67360 + 421 = 67781
Step 162: 67781 + 421 = 68202
Step 163: 68202 + 421 = 68623
Step 164: 68623 + 421 = 69044
Step 165: 69044 + 421 = 69465
Step 166: 69465 + 421 = 69886
Step 167: 69886 + 421 = 70307
Step 168: 70307 + 421 = 70728
Step 169: 70728 + 421 = 71149
Step 170: 71149 + 421 = 71570
Step 171: 71570 + 421 = 71991
Step 172: 71991 + 421 = 72412
Step 173: 72412 + 421 = 72833
Step 174: 72833 + 421 = 73254
Step 175: 73254 + 421 = 73675
Step 176: 73675 + 421 = 74096
Step 177: 74096 + 421 = 74517
Step 178: 74517 + 421 = 74938
Step 179: 74938 + 421 = 75359
Step 180: 75359 + 421 = 75780
Step 181: 75780 + 421 = 76201
Step 182: 76201 + 421 = 76622
Step 183: 76622 + 421 = 77043
Step 184: 77043 + 421 = 77464
Step 185: 77464 + 421 = 77885
Step 186: 77885 + 421 = 78306
Step 187: 78306 + 421 = 78727
Step 188: 78727 + 421 = 79148
Step 189: 79148 + 421 = 79569
Step 190: 79569 + 421 = 79990
Step 191: 79990 + 421 = 80411
Step 192: 80411 + 421 = 80832
Step 193: 80832 + 421 = 81253
Step 194: 81253 + 421 = 81674
Step 195: 81674 + 421 = 82095
Step 196: 82095 + 421 = 82516
Step 197: 82516 + 421 = 82937
Step 198: 82937 + 421 = 83358
Step 199: 83358 + 421 = 83779
Step 200: 83779 + 421 = 84200
Step 201: 84200 + 421 = 84621
Step 202: 84621 + 421 = 85042
Step 203: 85042 + 421 = 85463
Step 204: 85463 + 421 = 85884
Step 205: 85884 + 421 = 86305
Step 206: 86305 + 421 = 86726
Step 207: 86726 + 421 = 87147
Step 208: 87147 + 421 = 87568
Step 209: 87568 + 421 = 87989
Step 210: 87989 + 421 = 88410
Step 211: 88410 + 421 = 88831
Step 212: 88831 + 421 = 89252
Step 213: 89252 + 421 = 89673
Step 214: 89673 + 421 = 90094
Step 215: 90094 + 421 = 90515
Step 216: 90515 + 421 = 90936
Step 217: 90936 + 421 = 91357
Step 218: 91357 + 421 = 91778
Step 219: 91778 + 421 = 92199
Step 220: 92199 + 421 = 92620
Step 221: 92620 + 421 = 93041
Step 222: 93041 + 421 = 93462
Step 223: 93462 + 421 = 93883
Step 224: 93883 + 421 = 94304
Step 225: 94304 + 421 = 94725
Step 226: 94725 + 421 = 95146
Step 227: 95146 + 421 = 95567
Step 228: 95567 + 421 = 95988
Step 229: 95988 + 421 = 96409
Step 230: 96409 + 421 = 96830
Step 231: 96830 + 421 = 97251
Step 232: 97251 + 421 = 97672
Step 233: 97672 + 421 = 98093
Step 234: 98093 + 421 = 98514
Step 235: 98514 + 421 = 98935
Step 236: 98935 + 421 = 99356
Step 237: 99356 + 421 = 99777
Step 238: 99777 + 421 = 100198
Step 239: 100198 + 421 = 100619
Step 240: 100619 + 421 = 101040
Step 241: 101040 + 421 = 101461
Step 242: 101461 + 421 = 101882
Step 243: 101882 + 421 = 102303
Step 244: 102303 + 421 = 102724
Step 245: 102724 + 421 = 103145
Step 246: 103145 + 421 = 103566
Step 247: 103566 + 421 = 103987
Step 248: 103987 + 421 = 104408
Step 249: 104408 + 421 = 104829
Step 250: 104829 + 421 = 105250
Step 251: 105250 + 421 = 105671
Step 252: 105671 + 421 = 106092
Step 253: 106092 + 421 = 106513
Step 254: 106513 + 421 = 106934
Step 255: 106934 + 421 = 107355
Step 256: 107355 + 421 = 107776
Step 257: 107776 + 421 = 108197
Step 258: 108197 + 421 = 108618
Step 259: 108618 + 421 = 109039
Step 260: 109039 + 421 = 109460
Step 261: 109460 + 421 = 109881
Step 262: 109881 + 421 = 110302
Step 263: 110302 + 421 = 110723
Step 264: 110723 + 421 = 111144
Step 265: 111144 + 421 = 111565
Step 266: 111565 + 421 = 111986
Step 267: 111986 + 421 = 112407
Step 268: 112407 + 421 = 112828
Step 269: 112828 + 421 = 113249
Step 270: 113249 + 421 = 113670
Step 271: 113670 + 421 = 114091
Step 272: 114091 + 421 = 114512
Step 273: 114512 + 421 = 114933
Step 274: 114933 + 421 = 115354
Step 275: 115354 + 421 = 115775
Step 276: 115775 + 421 = 116196
Step 277: 116196 + 421 = 116617
Step 278: 116617 + 421 = 117038
Step 279: 117038 + 421 = 117459
Step 280: 117459 + 421 = 117880

So, 421*280 = 117880