Let's roll up our sleeves and solve this. We have 829 and we're going to multiply it by 66, essentially adding 829 to itself 66 times.
Step 1: 0 + 829 = 829
Step 2: 829 + 829 = 1658
Step 3: 1658 + 829 = 2487
Step 4: 2487 + 829 = 3316
Step 5: 3316 + 829 = 4145
Step 6: 4145 + 829 = 4974
Step 7: 4974 + 829 = 5803
Step 8: 5803 + 829 = 6632
Step 9: 6632 + 829 = 7461
Step 10: 7461 + 829 = 8290
Step 11: 8290 + 829 = 9119
Step 12: 9119 + 829 = 9948
Step 13: 9948 + 829 = 10777
Step 14: 10777 + 829 = 11606
Step 15: 11606 + 829 = 12435
Step 16: 12435 + 829 = 13264
Step 17: 13264 + 829 = 14093
Step 18: 14093 + 829 = 14922
Step 19: 14922 + 829 = 15751
Step 20: 15751 + 829 = 16580
Step 21: 16580 + 829 = 17409
Step 22: 17409 + 829 = 18238
Step 23: 18238 + 829 = 19067
Step 24: 19067 + 829 = 19896
Step 25: 19896 + 829 = 20725
Step 26: 20725 + 829 = 21554
Step 27: 21554 + 829 = 22383
Step 28: 22383 + 829 = 23212
Step 29: 23212 + 829 = 24041
Step 30: 24041 + 829 = 24870
Step 31: 24870 + 829 = 25699
Step 32: 25699 + 829 = 26528
Step 33: 26528 + 829 = 27357
Step 34: 27357 + 829 = 28186
Step 35: 28186 + 829 = 29015
Step 36: 29015 + 829 = 29844
Step 37: 29844 + 829 = 30673
Step 38: 30673 + 829 = 31502
Step 39: 31502 + 829 = 32331
Step 40: 32331 + 829 = 33160
Step 41: 33160 + 829 = 33989
Step 42: 33989 + 829 = 34818
Step 43: 34818 + 829 = 35647
Step 44: 35647 + 829 = 36476
Step 45: 36476 + 829 = 37305
Step 46: 37305 + 829 = 38134
Step 47: 38134 + 829 = 38963
Step 48: 38963 + 829 = 39792
Step 49: 39792 + 829 = 40621
Step 50: 40621 + 829 = 41450
Step 51: 41450 + 829 = 42279
Step 52: 42279 + 829 = 43108
Step 53: 43108 + 829 = 43937
Step 54: 43937 + 829 = 44766
Step 55: 44766 + 829 = 45595
Step 56: 45595 + 829 = 46424
Step 57: 46424 + 829 = 47253
Step 58: 47253 + 829 = 48082
Step 59: 48082 + 829 = 48911
Step 60: 48911 + 829 = 49740
Step 61: 49740 + 829 = 50569
Step 62: 50569 + 829 = 51398
Step 63: 51398 + 829 = 52227
Step 64: 52227 + 829 = 53056
Step 65: 53056 + 829 = 53885
Step 66: 53885 + 829 = 54714

So, 829*66 = 54714