Alright, let's solve this math problem step by step. First, we have the number 878. Next, we see the multiplication sign, which means we need to multiply something. And what are we multiplying it by? We multiply it by 161. So, we're going to take the number 878 and add it to itself 161 times.
Step 1: 0 + 878 = 878
Step 2: 878 + 878 = 1756
Step 3: 1756 + 878 = 2634
Step 4: 2634 + 878 = 3512
Step 5: 3512 + 878 = 4390
Step 6: 4390 + 878 = 5268
Step 7: 5268 + 878 = 6146
Step 8: 6146 + 878 = 7024
Step 9: 7024 + 878 = 7902
Step 10: 7902 + 878 = 8780
Step 11: 8780 + 878 = 9658
Step 12: 9658 + 878 = 10536
Step 13: 10536 + 878 = 11414
Step 14: 11414 + 878 = 12292
Step 15: 12292 + 878 = 13170
Step 16: 13170 + 878 = 14048
Step 17: 14048 + 878 = 14926
Step 18: 14926 + 878 = 15804
Step 19: 15804 + 878 = 16682
Step 20: 16682 + 878 = 17560
Step 21: 17560 + 878 = 18438
Step 22: 18438 + 878 = 19316
Step 23: 19316 + 878 = 20194
Step 24: 20194 + 878 = 21072
Step 25: 21072 + 878 = 21950
Step 26: 21950 + 878 = 22828
Step 27: 22828 + 878 = 23706
Step 28: 23706 + 878 = 24584
Step 29: 24584 + 878 = 25462
Step 30: 25462 + 878 = 26340
Step 31: 26340 + 878 = 27218
Step 32: 27218 + 878 = 28096
Step 33: 28096 + 878 = 28974
Step 34: 28974 + 878 = 29852
Step 35: 29852 + 878 = 30730
Step 36: 30730 + 878 = 31608
Step 37: 31608 + 878 = 32486
Step 38: 32486 + 878 = 33364
Step 39: 33364 + 878 = 34242
Step 40: 34242 + 878 = 35120
Step 41: 35120 + 878 = 35998
Step 42: 35998 + 878 = 36876
Step 43: 36876 + 878 = 37754
Step 44: 37754 + 878 = 38632
Step 45: 38632 + 878 = 39510
Step 46: 39510 + 878 = 40388
Step 47: 40388 + 878 = 41266
Step 48: 41266 + 878 = 42144
Step 49: 42144 + 878 = 43022
Step 50: 43022 + 878 = 43900
Step 51: 43900 + 878 = 44778
Step 52: 44778 + 878 = 45656
Step 53: 45656 + 878 = 46534
Step 54: 46534 + 878 = 47412
Step 55: 47412 + 878 = 48290
Step 56: 48290 + 878 = 49168
Step 57: 49168 + 878 = 50046
Step 58: 50046 + 878 = 50924
Step 59: 50924 + 878 = 51802
Step 60: 51802 + 878 = 52680
Step 61: 52680 + 878 = 53558
Step 62: 53558 + 878 = 54436
Step 63: 54436 + 878 = 55314
Step 64: 55314 + 878 = 56192
Step 65: 56192 + 878 = 57070
Step 66: 57070 + 878 = 57948
Step 67: 57948 + 878 = 58826
Step 68: 58826 + 878 = 59704
Step 69: 59704 + 878 = 60582
Step 70: 60582 + 878 = 61460
Step 71: 61460 + 878 = 62338
Step 72: 62338 + 878 = 63216
Step 73: 63216 + 878 = 64094
Step 74: 64094 + 878 = 64972
Step 75: 64972 + 878 = 65850
Step 76: 65850 + 878 = 66728
Step 77: 66728 + 878 = 67606
Step 78: 67606 + 878 = 68484
Step 79: 68484 + 878 = 69362
Step 80: 69362 + 878 = 70240
Step 81: 70240 + 878 = 71118
Step 82: 71118 + 878 = 71996
Step 83: 71996 + 878 = 72874
Step 84: 72874 + 878 = 73752
Step 85: 73752 + 878 = 74630
Step 86: 74630 + 878 = 75508
Step 87: 75508 + 878 = 76386
Step 88: 76386 + 878 = 77264
Step 89: 77264 + 878 = 78142
Step 90: 78142 + 878 = 79020
Step 91: 79020 + 878 = 79898
Step 92: 79898 + 878 = 80776
Step 93: 80776 + 878 = 81654
Step 94: 81654 + 878 = 82532
Step 95: 82532 + 878 = 83410
Step 96: 83410 + 878 = 84288
Step 97: 84288 + 878 = 85166
Step 98: 85166 + 878 = 86044
Step 99: 86044 + 878 = 86922
Step 100: 86922 + 878 = 87800
Step 101: 87800 + 878 = 88678
Step 102: 88678 + 878 = 89556
Step 103: 89556 + 878 = 90434
Step 104: 90434 + 878 = 91312
Step 105: 91312 + 878 = 92190
Step 106: 92190 + 878 = 93068
Step 107: 93068 + 878 = 93946
Step 108: 93946 + 878 = 94824
Step 109: 94824 + 878 = 95702
Step 110: 95702 + 878 = 96580
Step 111: 96580 + 878 = 97458
Step 112: 97458 + 878 = 98336
Step 113: 98336 + 878 = 99214
Step 114: 99214 + 878 = 100092
Step 115: 100092 + 878 = 100970
Step 116: 100970 + 878 = 101848
Step 117: 101848 + 878 = 102726
Step 118: 102726 + 878 = 103604
Step 119: 103604 + 878 = 104482
Step 120: 104482 + 878 = 105360
Step 121: 105360 + 878 = 106238
Step 122: 106238 + 878 = 107116
Step 123: 107116 + 878 = 107994
Step 124: 107994 + 878 = 108872
Step 125: 108872 + 878 = 109750
Step 126: 109750 + 878 = 110628
Step 127: 110628 + 878 = 111506
Step 128: 111506 + 878 = 112384
Step 129: 112384 + 878 = 113262
Step 130: 113262 + 878 = 114140
Step 131: 114140 + 878 = 115018
Step 132: 115018 + 878 = 115896
Step 133: 115896 + 878 = 116774
Step 134: 116774 + 878 = 117652
Step 135: 117652 + 878 = 118530
Step 136: 118530 + 878 = 119408
Step 137: 119408 + 878 = 120286
Step 138: 120286 + 878 = 121164
Step 139: 121164 + 878 = 122042
Step 140: 122042 + 878 = 122920
Step 141: 122920 + 878 = 123798
Step 142: 123798 + 878 = 124676
Step 143: 124676 + 878 = 125554
Step 144: 125554 + 878 = 126432
Step 145: 126432 + 878 = 127310
Step 146: 127310 + 878 = 128188
Step 147: 128188 + 878 = 129066
Step 148: 129066 + 878 = 129944
Step 149: 129944 + 878 = 130822
Step 150: 130822 + 878 = 131700
Step 151: 131700 + 878 = 132578
Step 152: 132578 + 878 = 133456
Step 153: 133456 + 878 = 134334
Step 154: 134334 + 878 = 135212
Step 155: 135212 + 878 = 136090
Step 156: 136090 + 878 = 136968
Step 157: 136968 + 878 = 137846
Step 158: 137846 + 878 = 138724
Step 159: 138724 + 878 = 139602
Step 160: 139602 + 878 = 140480
Step 161: 140480 + 878 = 141358

So, 878*161 = 141358