OK, let's crack this. We're given 792 and our task is to multiply it by 104. Essentially, we'll be adding 792 to itself 104 times.
Step 1: 0 + 792 = 792
Step 2: 792 + 792 = 1584
Step 3: 1584 + 792 = 2376
Step 4: 2376 + 792 = 3168
Step 5: 3168 + 792 = 3960
Step 6: 3960 + 792 = 4752
Step 7: 4752 + 792 = 5544
Step 8: 5544 + 792 = 6336
Step 9: 6336 + 792 = 7128
Step 10: 7128 + 792 = 7920
Step 11: 7920 + 792 = 8712
Step 12: 8712 + 792 = 9504
Step 13: 9504 + 792 = 10296
Step 14: 10296 + 792 = 11088
Step 15: 11088 + 792 = 11880
Step 16: 11880 + 792 = 12672
Step 17: 12672 + 792 = 13464
Step 18: 13464 + 792 = 14256
Step 19: 14256 + 792 = 15048
Step 20: 15048 + 792 = 15840
Step 21: 15840 + 792 = 16632
Step 22: 16632 + 792 = 17424
Step 23: 17424 + 792 = 18216
Step 24: 18216 + 792 = 19008
Step 25: 19008 + 792 = 19800
Step 26: 19800 + 792 = 20592
Step 27: 20592 + 792 = 21384
Step 28: 21384 + 792 = 22176
Step 29: 22176 + 792 = 22968
Step 30: 22968 + 792 = 23760
Step 31: 23760 + 792 = 24552
Step 32: 24552 + 792 = 25344
Step 33: 25344 + 792 = 26136
Step 34: 26136 + 792 = 26928
Step 35: 26928 + 792 = 27720
Step 36: 27720 + 792 = 28512
Step 37: 28512 + 792 = 29304
Step 38: 29304 + 792 = 30096
Step 39: 30096 + 792 = 30888
Step 40: 30888 + 792 = 31680
Step 41: 31680 + 792 = 32472
Step 42: 32472 + 792 = 33264
Step 43: 33264 + 792 = 34056
Step 44: 34056 + 792 = 34848
Step 45: 34848 + 792 = 35640
Step 46: 35640 + 792 = 36432
Step 47: 36432 + 792 = 37224
Step 48: 37224 + 792 = 38016
Step 49: 38016 + 792 = 38808
Step 50: 38808 + 792 = 39600
Step 51: 39600 + 792 = 40392
Step 52: 40392 + 792 = 41184
Step 53: 41184 + 792 = 41976
Step 54: 41976 + 792 = 42768
Step 55: 42768 + 792 = 43560
Step 56: 43560 + 792 = 44352
Step 57: 44352 + 792 = 45144
Step 58: 45144 + 792 = 45936
Step 59: 45936 + 792 = 46728
Step 60: 46728 + 792 = 47520
Step 61: 47520 + 792 = 48312
Step 62: 48312 + 792 = 49104
Step 63: 49104 + 792 = 49896
Step 64: 49896 + 792 = 50688
Step 65: 50688 + 792 = 51480
Step 66: 51480 + 792 = 52272
Step 67: 52272 + 792 = 53064
Step 68: 53064 + 792 = 53856
Step 69: 53856 + 792 = 54648
Step 70: 54648 + 792 = 55440
Step 71: 55440 + 792 = 56232
Step 72: 56232 + 792 = 57024
Step 73: 57024 + 792 = 57816
Step 74: 57816 + 792 = 58608
Step 75: 58608 + 792 = 59400
Step 76: 59400 + 792 = 60192
Step 77: 60192 + 792 = 60984
Step 78: 60984 + 792 = 61776
Step 79: 61776 + 792 = 62568
Step 80: 62568 + 792 = 63360
Step 81: 63360 + 792 = 64152
Step 82: 64152 + 792 = 64944
Step 83: 64944 + 792 = 65736
Step 84: 65736 + 792 = 66528
Step 85: 66528 + 792 = 67320
Step 86: 67320 + 792 = 68112
Step 87: 68112 + 792 = 68904
Step 88: 68904 + 792 = 69696
Step 89: 69696 + 792 = 70488
Step 90: 70488 + 792 = 71280
Step 91: 71280 + 792 = 72072
Step 92: 72072 + 792 = 72864
Step 93: 72864 + 792 = 73656
Step 94: 73656 + 792 = 74448
Step 95: 74448 + 792 = 75240
Step 96: 75240 + 792 = 76032
Step 97: 76032 + 792 = 76824
Step 98: 76824 + 792 = 77616
Step 99: 77616 + 792 = 78408
Step 100: 78408 + 792 = 79200
Step 101: 79200 + 792 = 79992
Step 102: 79992 + 792 = 80784
Step 103: 80784 + 792 = 81576
Step 104: 81576 + 792 = 82368

So, 792*104 = 82368