Alright, let's solve this math problem step by step. First, we have the number 339. Next, we see the multiplication sign, which means we need to multiply something. And what are we multiplying it by? We multiply it by 86. So, we're going to take the number 339 and add it to itself 86 times.
Step 1: 0 + 339 = 339
Step 2: 339 + 339 = 678
Step 3: 678 + 339 = 1017
Step 4: 1017 + 339 = 1356
Step 5: 1356 + 339 = 1695
Step 6: 1695 + 339 = 2034
Step 7: 2034 + 339 = 2373
Step 8: 2373 + 339 = 2712
Step 9: 2712 + 339 = 3051
Step 10: 3051 + 339 = 3390
Step 11: 3390 + 339 = 3729
Step 12: 3729 + 339 = 4068
Step 13: 4068 + 339 = 4407
Step 14: 4407 + 339 = 4746
Step 15: 4746 + 339 = 5085
Step 16: 5085 + 339 = 5424
Step 17: 5424 + 339 = 5763
Step 18: 5763 + 339 = 6102
Step 19: 6102 + 339 = 6441
Step 20: 6441 + 339 = 6780
Step 21: 6780 + 339 = 7119
Step 22: 7119 + 339 = 7458
Step 23: 7458 + 339 = 7797
Step 24: 7797 + 339 = 8136
Step 25: 8136 + 339 = 8475
Step 26: 8475 + 339 = 8814
Step 27: 8814 + 339 = 9153
Step 28: 9153 + 339 = 9492
Step 29: 9492 + 339 = 9831
Step 30: 9831 + 339 = 10170
Step 31: 10170 + 339 = 10509
Step 32: 10509 + 339 = 10848
Step 33: 10848 + 339 = 11187
Step 34: 11187 + 339 = 11526
Step 35: 11526 + 339 = 11865
Step 36: 11865 + 339 = 12204
Step 37: 12204 + 339 = 12543
Step 38: 12543 + 339 = 12882
Step 39: 12882 + 339 = 13221
Step 40: 13221 + 339 = 13560
Step 41: 13560 + 339 = 13899
Step 42: 13899 + 339 = 14238
Step 43: 14238 + 339 = 14577
Step 44: 14577 + 339 = 14916
Step 45: 14916 + 339 = 15255
Step 46: 15255 + 339 = 15594
Step 47: 15594 + 339 = 15933
Step 48: 15933 + 339 = 16272
Step 49: 16272 + 339 = 16611
Step 50: 16611 + 339 = 16950
Step 51: 16950 + 339 = 17289
Step 52: 17289 + 339 = 17628
Step 53: 17628 + 339 = 17967
Step 54: 17967 + 339 = 18306
Step 55: 18306 + 339 = 18645
Step 56: 18645 + 339 = 18984
Step 57: 18984 + 339 = 19323
Step 58: 19323 + 339 = 19662
Step 59: 19662 + 339 = 20001
Step 60: 20001 + 339 = 20340
Step 61: 20340 + 339 = 20679
Step 62: 20679 + 339 = 21018
Step 63: 21018 + 339 = 21357
Step 64: 21357 + 339 = 21696
Step 65: 21696 + 339 = 22035
Step 66: 22035 + 339 = 22374
Step 67: 22374 + 339 = 22713
Step 68: 22713 + 339 = 23052
Step 69: 23052 + 339 = 23391
Step 70: 23391 + 339 = 23730
Step 71: 23730 + 339 = 24069
Step 72: 24069 + 339 = 24408
Step 73: 24408 + 339 = 24747
Step 74: 24747 + 339 = 25086
Step 75: 25086 + 339 = 25425
Step 76: 25425 + 339 = 25764
Step 77: 25764 + 339 = 26103
Step 78: 26103 + 339 = 26442
Step 79: 26442 + 339 = 26781
Step 80: 26781 + 339 = 27120
Step 81: 27120 + 339 = 27459
Step 82: 27459 + 339 = 27798
Step 83: 27798 + 339 = 28137
Step 84: 28137 + 339 = 28476
Step 85: 28476 + 339 = 28815
Step 86: 28815 + 339 = 29154

So, 339*86 = 29154