Let's get this math done. We have 828 and we're going to multiply it by 124. This is the same as taking 828 and adding it to itself 124 times.
Step 1: 0 + 828 = 828
Step 2: 828 + 828 = 1656
Step 3: 1656 + 828 = 2484
Step 4: 2484 + 828 = 3312
Step 5: 3312 + 828 = 4140
Step 6: 4140 + 828 = 4968
Step 7: 4968 + 828 = 5796
Step 8: 5796 + 828 = 6624
Step 9: 6624 + 828 = 7452
Step 10: 7452 + 828 = 8280
Step 11: 8280 + 828 = 9108
Step 12: 9108 + 828 = 9936
Step 13: 9936 + 828 = 10764
Step 14: 10764 + 828 = 11592
Step 15: 11592 + 828 = 12420
Step 16: 12420 + 828 = 13248
Step 17: 13248 + 828 = 14076
Step 18: 14076 + 828 = 14904
Step 19: 14904 + 828 = 15732
Step 20: 15732 + 828 = 16560
Step 21: 16560 + 828 = 17388
Step 22: 17388 + 828 = 18216
Step 23: 18216 + 828 = 19044
Step 24: 19044 + 828 = 19872
Step 25: 19872 + 828 = 20700
Step 26: 20700 + 828 = 21528
Step 27: 21528 + 828 = 22356
Step 28: 22356 + 828 = 23184
Step 29: 23184 + 828 = 24012
Step 30: 24012 + 828 = 24840
Step 31: 24840 + 828 = 25668
Step 32: 25668 + 828 = 26496
Step 33: 26496 + 828 = 27324
Step 34: 27324 + 828 = 28152
Step 35: 28152 + 828 = 28980
Step 36: 28980 + 828 = 29808
Step 37: 29808 + 828 = 30636
Step 38: 30636 + 828 = 31464
Step 39: 31464 + 828 = 32292
Step 40: 32292 + 828 = 33120
Step 41: 33120 + 828 = 33948
Step 42: 33948 + 828 = 34776
Step 43: 34776 + 828 = 35604
Step 44: 35604 + 828 = 36432
Step 45: 36432 + 828 = 37260
Step 46: 37260 + 828 = 38088
Step 47: 38088 + 828 = 38916
Step 48: 38916 + 828 = 39744
Step 49: 39744 + 828 = 40572
Step 50: 40572 + 828 = 41400
Step 51: 41400 + 828 = 42228
Step 52: 42228 + 828 = 43056
Step 53: 43056 + 828 = 43884
Step 54: 43884 + 828 = 44712
Step 55: 44712 + 828 = 45540
Step 56: 45540 + 828 = 46368
Step 57: 46368 + 828 = 47196
Step 58: 47196 + 828 = 48024
Step 59: 48024 + 828 = 48852
Step 60: 48852 + 828 = 49680
Step 61: 49680 + 828 = 50508
Step 62: 50508 + 828 = 51336
Step 63: 51336 + 828 = 52164
Step 64: 52164 + 828 = 52992
Step 65: 52992 + 828 = 53820
Step 66: 53820 + 828 = 54648
Step 67: 54648 + 828 = 55476
Step 68: 55476 + 828 = 56304
Step 69: 56304 + 828 = 57132
Step 70: 57132 + 828 = 57960
Step 71: 57960 + 828 = 58788
Step 72: 58788 + 828 = 59616
Step 73: 59616 + 828 = 60444
Step 74: 60444 + 828 = 61272
Step 75: 61272 + 828 = 62100
Step 76: 62100 + 828 = 62928
Step 77: 62928 + 828 = 63756
Step 78: 63756 + 828 = 64584
Step 79: 64584 + 828 = 65412
Step 80: 65412 + 828 = 66240
Step 81: 66240 + 828 = 67068
Step 82: 67068 + 828 = 67896
Step 83: 67896 + 828 = 68724
Step 84: 68724 + 828 = 69552
Step 85: 69552 + 828 = 70380
Step 86: 70380 + 828 = 71208
Step 87: 71208 + 828 = 72036
Step 88: 72036 + 828 = 72864
Step 89: 72864 + 828 = 73692
Step 90: 73692 + 828 = 74520
Step 91: 74520 + 828 = 75348
Step 92: 75348 + 828 = 76176
Step 93: 76176 + 828 = 77004
Step 94: 77004 + 828 = 77832
Step 95: 77832 + 828 = 78660
Step 96: 78660 + 828 = 79488
Step 97: 79488 + 828 = 80316
Step 98: 80316 + 828 = 81144
Step 99: 81144 + 828 = 81972
Step 100: 81972 + 828 = 82800
Step 101: 82800 + 828 = 83628
Step 102: 83628 + 828 = 84456
Step 103: 84456 + 828 = 85284
Step 104: 85284 + 828 = 86112
Step 105: 86112 + 828 = 86940
Step 106: 86940 + 828 = 87768
Step 107: 87768 + 828 = 88596
Step 108: 88596 + 828 = 89424
Step 109: 89424 + 828 = 90252
Step 110: 90252 + 828 = 91080
Step 111: 91080 + 828 = 91908
Step 112: 91908 + 828 = 92736
Step 113: 92736 + 828 = 93564
Step 114: 93564 + 828 = 94392
Step 115: 94392 + 828 = 95220
Step 116: 95220 + 828 = 96048
Step 117: 96048 + 828 = 96876
Step 118: 96876 + 828 = 97704
Step 119: 97704 + 828 = 98532
Step 120: 98532 + 828 = 99360
Step 121: 99360 + 828 = 100188
Step 122: 100188 + 828 = 101016
Step 123: 101016 + 828 = 101844
Step 124: 101844 + 828 = 102672

So, 828*124 = 102672