Alright, let's solve this math problem step by step. First, we have the number 86. Next, we see the multiplication sign, which means we need to multiply something. And what are we multiplying it by? We multiply it by 78. So, we're going to take the number 86 and add it to itself 78 times.
Step 1: 0 + 86 = 86
Step 2: 86 + 86 = 172
Step 3: 172 + 86 = 258
Step 4: 258 + 86 = 344
Step 5: 344 + 86 = 430
Step 6: 430 + 86 = 516
Step 7: 516 + 86 = 602
Step 8: 602 + 86 = 688
Step 9: 688 + 86 = 774
Step 10: 774 + 86 = 860
Step 11: 860 + 86 = 946
Step 12: 946 + 86 = 1032
Step 13: 1032 + 86 = 1118
Step 14: 1118 + 86 = 1204
Step 15: 1204 + 86 = 1290
Step 16: 1290 + 86 = 1376
Step 17: 1376 + 86 = 1462
Step 18: 1462 + 86 = 1548
Step 19: 1548 + 86 = 1634
Step 20: 1634 + 86 = 1720
Step 21: 1720 + 86 = 1806
Step 22: 1806 + 86 = 1892
Step 23: 1892 + 86 = 1978
Step 24: 1978 + 86 = 2064
Step 25: 2064 + 86 = 2150
Step 26: 2150 + 86 = 2236
Step 27: 2236 + 86 = 2322
Step 28: 2322 + 86 = 2408
Step 29: 2408 + 86 = 2494
Step 30: 2494 + 86 = 2580
Step 31: 2580 + 86 = 2666
Step 32: 2666 + 86 = 2752
Step 33: 2752 + 86 = 2838
Step 34: 2838 + 86 = 2924
Step 35: 2924 + 86 = 3010
Step 36: 3010 + 86 = 3096
Step 37: 3096 + 86 = 3182
Step 38: 3182 + 86 = 3268
Step 39: 3268 + 86 = 3354
Step 40: 3354 + 86 = 3440
Step 41: 3440 + 86 = 3526
Step 42: 3526 + 86 = 3612
Step 43: 3612 + 86 = 3698
Step 44: 3698 + 86 = 3784
Step 45: 3784 + 86 = 3870
Step 46: 3870 + 86 = 3956
Step 47: 3956 + 86 = 4042
Step 48: 4042 + 86 = 4128
Step 49: 4128 + 86 = 4214
Step 50: 4214 + 86 = 4300
Step 51: 4300 + 86 = 4386
Step 52: 4386 + 86 = 4472
Step 53: 4472 + 86 = 4558
Step 54: 4558 + 86 = 4644
Step 55: 4644 + 86 = 4730
Step 56: 4730 + 86 = 4816
Step 57: 4816 + 86 = 4902
Step 58: 4902 + 86 = 4988
Step 59: 4988 + 86 = 5074
Step 60: 5074 + 86 = 5160
Step 61: 5160 + 86 = 5246
Step 62: 5246 + 86 = 5332
Step 63: 5332 + 86 = 5418
Step 64: 5418 + 86 = 5504
Step 65: 5504 + 86 = 5590
Step 66: 5590 + 86 = 5676
Step 67: 5676 + 86 = 5762
Step 68: 5762 + 86 = 5848
Step 69: 5848 + 86 = 5934
Step 70: 5934 + 86 = 6020
Step 71: 6020 + 86 = 6106
Step 72: 6106 + 86 = 6192
Step 73: 6192 + 86 = 6278
Step 74: 6278 + 86 = 6364
Step 75: 6364 + 86 = 6450
Step 76: 6450 + 86 = 6536
Step 77: 6536 + 86 = 6622
Step 78: 6622 + 86 = 6708

So, 86*78 = 6708