Alright, let's solve this math problem step by step. First, we have the number 815. Next, we see the multiplication sign, which means we need to multiply something. And what are we multiplying it by? We multiply it by 154. So, we're going to take the number 815 and add it to itself 154 times.
Step 1: 0 + 815 = 815
Step 2: 815 + 815 = 1630
Step 3: 1630 + 815 = 2445
Step 4: 2445 + 815 = 3260
Step 5: 3260 + 815 = 4075
Step 6: 4075 + 815 = 4890
Step 7: 4890 + 815 = 5705
Step 8: 5705 + 815 = 6520
Step 9: 6520 + 815 = 7335
Step 10: 7335 + 815 = 8150
Step 11: 8150 + 815 = 8965
Step 12: 8965 + 815 = 9780
Step 13: 9780 + 815 = 10595
Step 14: 10595 + 815 = 11410
Step 15: 11410 + 815 = 12225
Step 16: 12225 + 815 = 13040
Step 17: 13040 + 815 = 13855
Step 18: 13855 + 815 = 14670
Step 19: 14670 + 815 = 15485
Step 20: 15485 + 815 = 16300
Step 21: 16300 + 815 = 17115
Step 22: 17115 + 815 = 17930
Step 23: 17930 + 815 = 18745
Step 24: 18745 + 815 = 19560
Step 25: 19560 + 815 = 20375
Step 26: 20375 + 815 = 21190
Step 27: 21190 + 815 = 22005
Step 28: 22005 + 815 = 22820
Step 29: 22820 + 815 = 23635
Step 30: 23635 + 815 = 24450
Step 31: 24450 + 815 = 25265
Step 32: 25265 + 815 = 26080
Step 33: 26080 + 815 = 26895
Step 34: 26895 + 815 = 27710
Step 35: 27710 + 815 = 28525
Step 36: 28525 + 815 = 29340
Step 37: 29340 + 815 = 30155
Step 38: 30155 + 815 = 30970
Step 39: 30970 + 815 = 31785
Step 40: 31785 + 815 = 32600
Step 41: 32600 + 815 = 33415
Step 42: 33415 + 815 = 34230
Step 43: 34230 + 815 = 35045
Step 44: 35045 + 815 = 35860
Step 45: 35860 + 815 = 36675
Step 46: 36675 + 815 = 37490
Step 47: 37490 + 815 = 38305
Step 48: 38305 + 815 = 39120
Step 49: 39120 + 815 = 39935
Step 50: 39935 + 815 = 40750
Step 51: 40750 + 815 = 41565
Step 52: 41565 + 815 = 42380
Step 53: 42380 + 815 = 43195
Step 54: 43195 + 815 = 44010
Step 55: 44010 + 815 = 44825
Step 56: 44825 + 815 = 45640
Step 57: 45640 + 815 = 46455
Step 58: 46455 + 815 = 47270
Step 59: 47270 + 815 = 48085
Step 60: 48085 + 815 = 48900
Step 61: 48900 + 815 = 49715
Step 62: 49715 + 815 = 50530
Step 63: 50530 + 815 = 51345
Step 64: 51345 + 815 = 52160
Step 65: 52160 + 815 = 52975
Step 66: 52975 + 815 = 53790
Step 67: 53790 + 815 = 54605
Step 68: 54605 + 815 = 55420
Step 69: 55420 + 815 = 56235
Step 70: 56235 + 815 = 57050
Step 71: 57050 + 815 = 57865
Step 72: 57865 + 815 = 58680
Step 73: 58680 + 815 = 59495
Step 74: 59495 + 815 = 60310
Step 75: 60310 + 815 = 61125
Step 76: 61125 + 815 = 61940
Step 77: 61940 + 815 = 62755
Step 78: 62755 + 815 = 63570
Step 79: 63570 + 815 = 64385
Step 80: 64385 + 815 = 65200
Step 81: 65200 + 815 = 66015
Step 82: 66015 + 815 = 66830
Step 83: 66830 + 815 = 67645
Step 84: 67645 + 815 = 68460
Step 85: 68460 + 815 = 69275
Step 86: 69275 + 815 = 70090
Step 87: 70090 + 815 = 70905
Step 88: 70905 + 815 = 71720
Step 89: 71720 + 815 = 72535
Step 90: 72535 + 815 = 73350
Step 91: 73350 + 815 = 74165
Step 92: 74165 + 815 = 74980
Step 93: 74980 + 815 = 75795
Step 94: 75795 + 815 = 76610
Step 95: 76610 + 815 = 77425
Step 96: 77425 + 815 = 78240
Step 97: 78240 + 815 = 79055
Step 98: 79055 + 815 = 79870
Step 99: 79870 + 815 = 80685
Step 100: 80685 + 815 = 81500
Step 101: 81500 + 815 = 82315
Step 102: 82315 + 815 = 83130
Step 103: 83130 + 815 = 83945
Step 104: 83945 + 815 = 84760
Step 105: 84760 + 815 = 85575
Step 106: 85575 + 815 = 86390
Step 107: 86390 + 815 = 87205
Step 108: 87205 + 815 = 88020
Step 109: 88020 + 815 = 88835
Step 110: 88835 + 815 = 89650
Step 111: 89650 + 815 = 90465
Step 112: 90465 + 815 = 91280
Step 113: 91280 + 815 = 92095
Step 114: 92095 + 815 = 92910
Step 115: 92910 + 815 = 93725
Step 116: 93725 + 815 = 94540
Step 117: 94540 + 815 = 95355
Step 118: 95355 + 815 = 96170
Step 119: 96170 + 815 = 96985
Step 120: 96985 + 815 = 97800
Step 121: 97800 + 815 = 98615
Step 122: 98615 + 815 = 99430
Step 123: 99430 + 815 = 100245
Step 124: 100245 + 815 = 101060
Step 125: 101060 + 815 = 101875
Step 126: 101875 + 815 = 102690
Step 127: 102690 + 815 = 103505
Step 128: 103505 + 815 = 104320
Step 129: 104320 + 815 = 105135
Step 130: 105135 + 815 = 105950
Step 131: 105950 + 815 = 106765
Step 132: 106765 + 815 = 107580
Step 133: 107580 + 815 = 108395
Step 134: 108395 + 815 = 109210
Step 135: 109210 + 815 = 110025
Step 136: 110025 + 815 = 110840
Step 137: 110840 + 815 = 111655
Step 138: 111655 + 815 = 112470
Step 139: 112470 + 815 = 113285
Step 140: 113285 + 815 = 114100
Step 141: 114100 + 815 = 114915
Step 142: 114915 + 815 = 115730
Step 143: 115730 + 815 = 116545
Step 144: 116545 + 815 = 117360
Step 145: 117360 + 815 = 118175
Step 146: 118175 + 815 = 118990
Step 147: 118990 + 815 = 119805
Step 148: 119805 + 815 = 120620
Step 149: 120620 + 815 = 121435
Step 150: 121435 + 815 = 122250
Step 151: 122250 + 815 = 123065
Step 152: 123065 + 815 = 123880
Step 153: 123880 + 815 = 124695
Step 154: 124695 + 815 = 125510

So, 815*154 = 125510