Alright, let's solve this math problem step by step. First, we have the number 817. Next, we see the multiplication sign, which means we need to multiply something. And what are we multiplying it by? We multiply it by 153. So, we're going to take the number 817 and add it to itself 153 times.
Step 1: 0 + 817 = 817
Step 2: 817 + 817 = 1634
Step 3: 1634 + 817 = 2451
Step 4: 2451 + 817 = 3268
Step 5: 3268 + 817 = 4085
Step 6: 4085 + 817 = 4902
Step 7: 4902 + 817 = 5719
Step 8: 5719 + 817 = 6536
Step 9: 6536 + 817 = 7353
Step 10: 7353 + 817 = 8170
Step 11: 8170 + 817 = 8987
Step 12: 8987 + 817 = 9804
Step 13: 9804 + 817 = 10621
Step 14: 10621 + 817 = 11438
Step 15: 11438 + 817 = 12255
Step 16: 12255 + 817 = 13072
Step 17: 13072 + 817 = 13889
Step 18: 13889 + 817 = 14706
Step 19: 14706 + 817 = 15523
Step 20: 15523 + 817 = 16340
Step 21: 16340 + 817 = 17157
Step 22: 17157 + 817 = 17974
Step 23: 17974 + 817 = 18791
Step 24: 18791 + 817 = 19608
Step 25: 19608 + 817 = 20425
Step 26: 20425 + 817 = 21242
Step 27: 21242 + 817 = 22059
Step 28: 22059 + 817 = 22876
Step 29: 22876 + 817 = 23693
Step 30: 23693 + 817 = 24510
Step 31: 24510 + 817 = 25327
Step 32: 25327 + 817 = 26144
Step 33: 26144 + 817 = 26961
Step 34: 26961 + 817 = 27778
Step 35: 27778 + 817 = 28595
Step 36: 28595 + 817 = 29412
Step 37: 29412 + 817 = 30229
Step 38: 30229 + 817 = 31046
Step 39: 31046 + 817 = 31863
Step 40: 31863 + 817 = 32680
Step 41: 32680 + 817 = 33497
Step 42: 33497 + 817 = 34314
Step 43: 34314 + 817 = 35131
Step 44: 35131 + 817 = 35948
Step 45: 35948 + 817 = 36765
Step 46: 36765 + 817 = 37582
Step 47: 37582 + 817 = 38399
Step 48: 38399 + 817 = 39216
Step 49: 39216 + 817 = 40033
Step 50: 40033 + 817 = 40850
Step 51: 40850 + 817 = 41667
Step 52: 41667 + 817 = 42484
Step 53: 42484 + 817 = 43301
Step 54: 43301 + 817 = 44118
Step 55: 44118 + 817 = 44935
Step 56: 44935 + 817 = 45752
Step 57: 45752 + 817 = 46569
Step 58: 46569 + 817 = 47386
Step 59: 47386 + 817 = 48203
Step 60: 48203 + 817 = 49020
Step 61: 49020 + 817 = 49837
Step 62: 49837 + 817 = 50654
Step 63: 50654 + 817 = 51471
Step 64: 51471 + 817 = 52288
Step 65: 52288 + 817 = 53105
Step 66: 53105 + 817 = 53922
Step 67: 53922 + 817 = 54739
Step 68: 54739 + 817 = 55556
Step 69: 55556 + 817 = 56373
Step 70: 56373 + 817 = 57190
Step 71: 57190 + 817 = 58007
Step 72: 58007 + 817 = 58824
Step 73: 58824 + 817 = 59641
Step 74: 59641 + 817 = 60458
Step 75: 60458 + 817 = 61275
Step 76: 61275 + 817 = 62092
Step 77: 62092 + 817 = 62909
Step 78: 62909 + 817 = 63726
Step 79: 63726 + 817 = 64543
Step 80: 64543 + 817 = 65360
Step 81: 65360 + 817 = 66177
Step 82: 66177 + 817 = 66994
Step 83: 66994 + 817 = 67811
Step 84: 67811 + 817 = 68628
Step 85: 68628 + 817 = 69445
Step 86: 69445 + 817 = 70262
Step 87: 70262 + 817 = 71079
Step 88: 71079 + 817 = 71896
Step 89: 71896 + 817 = 72713
Step 90: 72713 + 817 = 73530
Step 91: 73530 + 817 = 74347
Step 92: 74347 + 817 = 75164
Step 93: 75164 + 817 = 75981
Step 94: 75981 + 817 = 76798
Step 95: 76798 + 817 = 77615
Step 96: 77615 + 817 = 78432
Step 97: 78432 + 817 = 79249
Step 98: 79249 + 817 = 80066
Step 99: 80066 + 817 = 80883
Step 100: 80883 + 817 = 81700
Step 101: 81700 + 817 = 82517
Step 102: 82517 + 817 = 83334
Step 103: 83334 + 817 = 84151
Step 104: 84151 + 817 = 84968
Step 105: 84968 + 817 = 85785
Step 106: 85785 + 817 = 86602
Step 107: 86602 + 817 = 87419
Step 108: 87419 + 817 = 88236
Step 109: 88236 + 817 = 89053
Step 110: 89053 + 817 = 89870
Step 111: 89870 + 817 = 90687
Step 112: 90687 + 817 = 91504
Step 113: 91504 + 817 = 92321
Step 114: 92321 + 817 = 93138
Step 115: 93138 + 817 = 93955
Step 116: 93955 + 817 = 94772
Step 117: 94772 + 817 = 95589
Step 118: 95589 + 817 = 96406
Step 119: 96406 + 817 = 97223
Step 120: 97223 + 817 = 98040
Step 121: 98040 + 817 = 98857
Step 122: 98857 + 817 = 99674
Step 123: 99674 + 817 = 100491
Step 124: 100491 + 817 = 101308
Step 125: 101308 + 817 = 102125
Step 126: 102125 + 817 = 102942
Step 127: 102942 + 817 = 103759
Step 128: 103759 + 817 = 104576
Step 129: 104576 + 817 = 105393
Step 130: 105393 + 817 = 106210
Step 131: 106210 + 817 = 107027
Step 132: 107027 + 817 = 107844
Step 133: 107844 + 817 = 108661
Step 134: 108661 + 817 = 109478
Step 135: 109478 + 817 = 110295
Step 136: 110295 + 817 = 111112
Step 137: 111112 + 817 = 111929
Step 138: 111929 + 817 = 112746
Step 139: 112746 + 817 = 113563
Step 140: 113563 + 817 = 114380
Step 141: 114380 + 817 = 115197
Step 142: 115197 + 817 = 116014
Step 143: 116014 + 817 = 116831
Step 144: 116831 + 817 = 117648
Step 145: 117648 + 817 = 118465
Step 146: 118465 + 817 = 119282
Step 147: 119282 + 817 = 120099
Step 148: 120099 + 817 = 120916
Step 149: 120916 + 817 = 121733
Step 150: 121733 + 817 = 122550
Step 151: 122550 + 817 = 123367
Step 152: 123367 + 817 = 124184
Step 153: 124184 + 817 = 125001

So, 817*153 = 125001