Without delay, let's solve this. We've got 207 and we will be multiplying it by 86, that is, adding 207 to itself 86 times.
Step 1: 0 + 207 = 207
Step 2: 207 + 207 = 414
Step 3: 414 + 207 = 621
Step 4: 621 + 207 = 828
Step 5: 828 + 207 = 1035
Step 6: 1035 + 207 = 1242
Step 7: 1242 + 207 = 1449
Step 8: 1449 + 207 = 1656
Step 9: 1656 + 207 = 1863
Step 10: 1863 + 207 = 2070
Step 11: 2070 + 207 = 2277
Step 12: 2277 + 207 = 2484
Step 13: 2484 + 207 = 2691
Step 14: 2691 + 207 = 2898
Step 15: 2898 + 207 = 3105
Step 16: 3105 + 207 = 3312
Step 17: 3312 + 207 = 3519
Step 18: 3519 + 207 = 3726
Step 19: 3726 + 207 = 3933
Step 20: 3933 + 207 = 4140
Step 21: 4140 + 207 = 4347
Step 22: 4347 + 207 = 4554
Step 23: 4554 + 207 = 4761
Step 24: 4761 + 207 = 4968
Step 25: 4968 + 207 = 5175
Step 26: 5175 + 207 = 5382
Step 27: 5382 + 207 = 5589
Step 28: 5589 + 207 = 5796
Step 29: 5796 + 207 = 6003
Step 30: 6003 + 207 = 6210
Step 31: 6210 + 207 = 6417
Step 32: 6417 + 207 = 6624
Step 33: 6624 + 207 = 6831
Step 34: 6831 + 207 = 7038
Step 35: 7038 + 207 = 7245
Step 36: 7245 + 207 = 7452
Step 37: 7452 + 207 = 7659
Step 38: 7659 + 207 = 7866
Step 39: 7866 + 207 = 8073
Step 40: 8073 + 207 = 8280
Step 41: 8280 + 207 = 8487
Step 42: 8487 + 207 = 8694
Step 43: 8694 + 207 = 8901
Step 44: 8901 + 207 = 9108
Step 45: 9108 + 207 = 9315
Step 46: 9315 + 207 = 9522
Step 47: 9522 + 207 = 9729
Step 48: 9729 + 207 = 9936
Step 49: 9936 + 207 = 10143
Step 50: 10143 + 207 = 10350
Step 51: 10350 + 207 = 10557
Step 52: 10557 + 207 = 10764
Step 53: 10764 + 207 = 10971
Step 54: 10971 + 207 = 11178
Step 55: 11178 + 207 = 11385
Step 56: 11385 + 207 = 11592
Step 57: 11592 + 207 = 11799
Step 58: 11799 + 207 = 12006
Step 59: 12006 + 207 = 12213
Step 60: 12213 + 207 = 12420
Step 61: 12420 + 207 = 12627
Step 62: 12627 + 207 = 12834
Step 63: 12834 + 207 = 13041
Step 64: 13041 + 207 = 13248
Step 65: 13248 + 207 = 13455
Step 66: 13455 + 207 = 13662
Step 67: 13662 + 207 = 13869
Step 68: 13869 + 207 = 14076
Step 69: 14076 + 207 = 14283
Step 70: 14283 + 207 = 14490
Step 71: 14490 + 207 = 14697
Step 72: 14697 + 207 = 14904
Step 73: 14904 + 207 = 15111
Step 74: 15111 + 207 = 15318
Step 75: 15318 + 207 = 15525
Step 76: 15525 + 207 = 15732
Step 77: 15732 + 207 = 15939
Step 78: 15939 + 207 = 16146
Step 79: 16146 + 207 = 16353
Step 80: 16353 + 207 = 16560
Step 81: 16560 + 207 = 16767
Step 82: 16767 + 207 = 16974
Step 83: 16974 + 207 = 17181
Step 84: 17181 + 207 = 17388
Step 85: 17388 + 207 = 17595
Step 86: 17595 + 207 = 17802

So, 207*86 = 17802