Sure thing, let's get straight to it. We start with 17 and we're going to multiply it by 84, which means adding 17 to itself 84 times.
Step 1: 0 + 17 = 17
Step 2: 17 + 17 = 34
Step 3: 34 + 17 = 51
Step 4: 51 + 17 = 68
Step 5: 68 + 17 = 85
Step 6: 85 + 17 = 102
Step 7: 102 + 17 = 119
Step 8: 119 + 17 = 136
Step 9: 136 + 17 = 153
Step 10: 153 + 17 = 170
Step 11: 170 + 17 = 187
Step 12: 187 + 17 = 204
Step 13: 204 + 17 = 221
Step 14: 221 + 17 = 238
Step 15: 238 + 17 = 255
Step 16: 255 + 17 = 272
Step 17: 272 + 17 = 289
Step 18: 289 + 17 = 306
Step 19: 306 + 17 = 323
Step 20: 323 + 17 = 340
Step 21: 340 + 17 = 357
Step 22: 357 + 17 = 374
Step 23: 374 + 17 = 391
Step 24: 391 + 17 = 408
Step 25: 408 + 17 = 425
Step 26: 425 + 17 = 442
Step 27: 442 + 17 = 459
Step 28: 459 + 17 = 476
Step 29: 476 + 17 = 493
Step 30: 493 + 17 = 510
Step 31: 510 + 17 = 527
Step 32: 527 + 17 = 544
Step 33: 544 + 17 = 561
Step 34: 561 + 17 = 578
Step 35: 578 + 17 = 595
Step 36: 595 + 17 = 612
Step 37: 612 + 17 = 629
Step 38: 629 + 17 = 646
Step 39: 646 + 17 = 663
Step 40: 663 + 17 = 680
Step 41: 680 + 17 = 697
Step 42: 697 + 17 = 714
Step 43: 714 + 17 = 731
Step 44: 731 + 17 = 748
Step 45: 748 + 17 = 765
Step 46: 765 + 17 = 782
Step 47: 782 + 17 = 799
Step 48: 799 + 17 = 816
Step 49: 816 + 17 = 833
Step 50: 833 + 17 = 850
Step 51: 850 + 17 = 867
Step 52: 867 + 17 = 884
Step 53: 884 + 17 = 901
Step 54: 901 + 17 = 918
Step 55: 918 + 17 = 935
Step 56: 935 + 17 = 952
Step 57: 952 + 17 = 969
Step 58: 969 + 17 = 986
Step 59: 986 + 17 = 1003
Step 60: 1003 + 17 = 1020
Step 61: 1020 + 17 = 1037
Step 62: 1037 + 17 = 1054
Step 63: 1054 + 17 = 1071
Step 64: 1071 + 17 = 1088
Step 65: 1088 + 17 = 1105
Step 66: 1105 + 17 = 1122
Step 67: 1122 + 17 = 1139
Step 68: 1139 + 17 = 1156
Step 69: 1156 + 17 = 1173
Step 70: 1173 + 17 = 1190
Step 71: 1190 + 17 = 1207
Step 72: 1207 + 17 = 1224
Step 73: 1224 + 17 = 1241
Step 74: 1241 + 17 = 1258
Step 75: 1258 + 17 = 1275
Step 76: 1275 + 17 = 1292
Step 77: 1292 + 17 = 1309
Step 78: 1309 + 17 = 1326
Step 79: 1326 + 17 = 1343
Step 80: 1343 + 17 = 1360
Step 81: 1360 + 17 = 1377
Step 82: 1377 + 17 = 1394
Step 83: 1394 + 17 = 1411
Step 84: 1411 + 17 = 1428

So, 17*84 = 1428