Alright, let's solve this math problem step by step. First, we have the number 783. 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 783 and add it to itself 86 times.
Step 1: 0 + 783 = 783
Step 2: 783 + 783 = 1566
Step 3: 1566 + 783 = 2349
Step 4: 2349 + 783 = 3132
Step 5: 3132 + 783 = 3915
Step 6: 3915 + 783 = 4698
Step 7: 4698 + 783 = 5481
Step 8: 5481 + 783 = 6264
Step 9: 6264 + 783 = 7047
Step 10: 7047 + 783 = 7830
Step 11: 7830 + 783 = 8613
Step 12: 8613 + 783 = 9396
Step 13: 9396 + 783 = 10179
Step 14: 10179 + 783 = 10962
Step 15: 10962 + 783 = 11745
Step 16: 11745 + 783 = 12528
Step 17: 12528 + 783 = 13311
Step 18: 13311 + 783 = 14094
Step 19: 14094 + 783 = 14877
Step 20: 14877 + 783 = 15660
Step 21: 15660 + 783 = 16443
Step 22: 16443 + 783 = 17226
Step 23: 17226 + 783 = 18009
Step 24: 18009 + 783 = 18792
Step 25: 18792 + 783 = 19575
Step 26: 19575 + 783 = 20358
Step 27: 20358 + 783 = 21141
Step 28: 21141 + 783 = 21924
Step 29: 21924 + 783 = 22707
Step 30: 22707 + 783 = 23490
Step 31: 23490 + 783 = 24273
Step 32: 24273 + 783 = 25056
Step 33: 25056 + 783 = 25839
Step 34: 25839 + 783 = 26622
Step 35: 26622 + 783 = 27405
Step 36: 27405 + 783 = 28188
Step 37: 28188 + 783 = 28971
Step 38: 28971 + 783 = 29754
Step 39: 29754 + 783 = 30537
Step 40: 30537 + 783 = 31320
Step 41: 31320 + 783 = 32103
Step 42: 32103 + 783 = 32886
Step 43: 32886 + 783 = 33669
Step 44: 33669 + 783 = 34452
Step 45: 34452 + 783 = 35235
Step 46: 35235 + 783 = 36018
Step 47: 36018 + 783 = 36801
Step 48: 36801 + 783 = 37584
Step 49: 37584 + 783 = 38367
Step 50: 38367 + 783 = 39150
Step 51: 39150 + 783 = 39933
Step 52: 39933 + 783 = 40716
Step 53: 40716 + 783 = 41499
Step 54: 41499 + 783 = 42282
Step 55: 42282 + 783 = 43065
Step 56: 43065 + 783 = 43848
Step 57: 43848 + 783 = 44631
Step 58: 44631 + 783 = 45414
Step 59: 45414 + 783 = 46197
Step 60: 46197 + 783 = 46980
Step 61: 46980 + 783 = 47763
Step 62: 47763 + 783 = 48546
Step 63: 48546 + 783 = 49329
Step 64: 49329 + 783 = 50112
Step 65: 50112 + 783 = 50895
Step 66: 50895 + 783 = 51678
Step 67: 51678 + 783 = 52461
Step 68: 52461 + 783 = 53244
Step 69: 53244 + 783 = 54027
Step 70: 54027 + 783 = 54810
Step 71: 54810 + 783 = 55593
Step 72: 55593 + 783 = 56376
Step 73: 56376 + 783 = 57159
Step 74: 57159 + 783 = 57942
Step 75: 57942 + 783 = 58725
Step 76: 58725 + 783 = 59508
Step 77: 59508 + 783 = 60291
Step 78: 60291 + 783 = 61074
Step 79: 61074 + 783 = 61857
Step 80: 61857 + 783 = 62640
Step 81: 62640 + 783 = 63423
Step 82: 63423 + 783 = 64206
Step 83: 64206 + 783 = 64989
Step 84: 64989 + 783 = 65772
Step 85: 65772 + 783 = 66555
Step 86: 66555 + 783 = 67338

So, 783*86 = 67338