Sure thing, let's get straight to it. We start with 543 and we're going to multiply it by 79, which means adding 543 to itself 79 times.
Step 1: 0 + 543 = 543
Step 2: 543 + 543 = 1086
Step 3: 1086 + 543 = 1629
Step 4: 1629 + 543 = 2172
Step 5: 2172 + 543 = 2715
Step 6: 2715 + 543 = 3258
Step 7: 3258 + 543 = 3801
Step 8: 3801 + 543 = 4344
Step 9: 4344 + 543 = 4887
Step 10: 4887 + 543 = 5430
Step 11: 5430 + 543 = 5973
Step 12: 5973 + 543 = 6516
Step 13: 6516 + 543 = 7059
Step 14: 7059 + 543 = 7602
Step 15: 7602 + 543 = 8145
Step 16: 8145 + 543 = 8688
Step 17: 8688 + 543 = 9231
Step 18: 9231 + 543 = 9774
Step 19: 9774 + 543 = 10317
Step 20: 10317 + 543 = 10860
Step 21: 10860 + 543 = 11403
Step 22: 11403 + 543 = 11946
Step 23: 11946 + 543 = 12489
Step 24: 12489 + 543 = 13032
Step 25: 13032 + 543 = 13575
Step 26: 13575 + 543 = 14118
Step 27: 14118 + 543 = 14661
Step 28: 14661 + 543 = 15204
Step 29: 15204 + 543 = 15747
Step 30: 15747 + 543 = 16290
Step 31: 16290 + 543 = 16833
Step 32: 16833 + 543 = 17376
Step 33: 17376 + 543 = 17919
Step 34: 17919 + 543 = 18462
Step 35: 18462 + 543 = 19005
Step 36: 19005 + 543 = 19548
Step 37: 19548 + 543 = 20091
Step 38: 20091 + 543 = 20634
Step 39: 20634 + 543 = 21177
Step 40: 21177 + 543 = 21720
Step 41: 21720 + 543 = 22263
Step 42: 22263 + 543 = 22806
Step 43: 22806 + 543 = 23349
Step 44: 23349 + 543 = 23892
Step 45: 23892 + 543 = 24435
Step 46: 24435 + 543 = 24978
Step 47: 24978 + 543 = 25521
Step 48: 25521 + 543 = 26064
Step 49: 26064 + 543 = 26607
Step 50: 26607 + 543 = 27150
Step 51: 27150 + 543 = 27693
Step 52: 27693 + 543 = 28236
Step 53: 28236 + 543 = 28779
Step 54: 28779 + 543 = 29322
Step 55: 29322 + 543 = 29865
Step 56: 29865 + 543 = 30408
Step 57: 30408 + 543 = 30951
Step 58: 30951 + 543 = 31494
Step 59: 31494 + 543 = 32037
Step 60: 32037 + 543 = 32580
Step 61: 32580 + 543 = 33123
Step 62: 33123 + 543 = 33666
Step 63: 33666 + 543 = 34209
Step 64: 34209 + 543 = 34752
Step 65: 34752 + 543 = 35295
Step 66: 35295 + 543 = 35838
Step 67: 35838 + 543 = 36381
Step 68: 36381 + 543 = 36924
Step 69: 36924 + 543 = 37467
Step 70: 37467 + 543 = 38010
Step 71: 38010 + 543 = 38553
Step 72: 38553 + 543 = 39096
Step 73: 39096 + 543 = 39639
Step 74: 39639 + 543 = 40182
Step 75: 40182 + 543 = 40725
Step 76: 40725 + 543 = 41268
Step 77: 41268 + 543 = 41811
Step 78: 41811 + 543 = 42354
Step 79: 42354 + 543 = 42897

So, 543*79 = 42897