Alright, let's solve this math problem step by step. First, we have the number 890. Next, we see the multiplication sign, which means we need to multiply something. And what are we multiplying it by? We multiply it by 157. So, we're going to take the number 890 and add it to itself 157 times.
Step 1: 0 + 890 = 890
Step 2: 890 + 890 = 1780
Step 3: 1780 + 890 = 2670
Step 4: 2670 + 890 = 3560
Step 5: 3560 + 890 = 4450
Step 6: 4450 + 890 = 5340
Step 7: 5340 + 890 = 6230
Step 8: 6230 + 890 = 7120
Step 9: 7120 + 890 = 8010
Step 10: 8010 + 890 = 8900
Step 11: 8900 + 890 = 9790
Step 12: 9790 + 890 = 10680
Step 13: 10680 + 890 = 11570
Step 14: 11570 + 890 = 12460
Step 15: 12460 + 890 = 13350
Step 16: 13350 + 890 = 14240
Step 17: 14240 + 890 = 15130
Step 18: 15130 + 890 = 16020
Step 19: 16020 + 890 = 16910
Step 20: 16910 + 890 = 17800
Step 21: 17800 + 890 = 18690
Step 22: 18690 + 890 = 19580
Step 23: 19580 + 890 = 20470
Step 24: 20470 + 890 = 21360
Step 25: 21360 + 890 = 22250
Step 26: 22250 + 890 = 23140
Step 27: 23140 + 890 = 24030
Step 28: 24030 + 890 = 24920
Step 29: 24920 + 890 = 25810
Step 30: 25810 + 890 = 26700
Step 31: 26700 + 890 = 27590
Step 32: 27590 + 890 = 28480
Step 33: 28480 + 890 = 29370
Step 34: 29370 + 890 = 30260
Step 35: 30260 + 890 = 31150
Step 36: 31150 + 890 = 32040
Step 37: 32040 + 890 = 32930
Step 38: 32930 + 890 = 33820
Step 39: 33820 + 890 = 34710
Step 40: 34710 + 890 = 35600
Step 41: 35600 + 890 = 36490
Step 42: 36490 + 890 = 37380
Step 43: 37380 + 890 = 38270
Step 44: 38270 + 890 = 39160
Step 45: 39160 + 890 = 40050
Step 46: 40050 + 890 = 40940
Step 47: 40940 + 890 = 41830
Step 48: 41830 + 890 = 42720
Step 49: 42720 + 890 = 43610
Step 50: 43610 + 890 = 44500
Step 51: 44500 + 890 = 45390
Step 52: 45390 + 890 = 46280
Step 53: 46280 + 890 = 47170
Step 54: 47170 + 890 = 48060
Step 55: 48060 + 890 = 48950
Step 56: 48950 + 890 = 49840
Step 57: 49840 + 890 = 50730
Step 58: 50730 + 890 = 51620
Step 59: 51620 + 890 = 52510
Step 60: 52510 + 890 = 53400
Step 61: 53400 + 890 = 54290
Step 62: 54290 + 890 = 55180
Step 63: 55180 + 890 = 56070
Step 64: 56070 + 890 = 56960
Step 65: 56960 + 890 = 57850
Step 66: 57850 + 890 = 58740
Step 67: 58740 + 890 = 59630
Step 68: 59630 + 890 = 60520
Step 69: 60520 + 890 = 61410
Step 70: 61410 + 890 = 62300
Step 71: 62300 + 890 = 63190
Step 72: 63190 + 890 = 64080
Step 73: 64080 + 890 = 64970
Step 74: 64970 + 890 = 65860
Step 75: 65860 + 890 = 66750
Step 76: 66750 + 890 = 67640
Step 77: 67640 + 890 = 68530
Step 78: 68530 + 890 = 69420
Step 79: 69420 + 890 = 70310
Step 80: 70310 + 890 = 71200
Step 81: 71200 + 890 = 72090
Step 82: 72090 + 890 = 72980
Step 83: 72980 + 890 = 73870
Step 84: 73870 + 890 = 74760
Step 85: 74760 + 890 = 75650
Step 86: 75650 + 890 = 76540
Step 87: 76540 + 890 = 77430
Step 88: 77430 + 890 = 78320
Step 89: 78320 + 890 = 79210
Step 90: 79210 + 890 = 80100
Step 91: 80100 + 890 = 80990
Step 92: 80990 + 890 = 81880
Step 93: 81880 + 890 = 82770
Step 94: 82770 + 890 = 83660
Step 95: 83660 + 890 = 84550
Step 96: 84550 + 890 = 85440
Step 97: 85440 + 890 = 86330
Step 98: 86330 + 890 = 87220
Step 99: 87220 + 890 = 88110
Step 100: 88110 + 890 = 89000
Step 101: 89000 + 890 = 89890
Step 102: 89890 + 890 = 90780
Step 103: 90780 + 890 = 91670
Step 104: 91670 + 890 = 92560
Step 105: 92560 + 890 = 93450
Step 106: 93450 + 890 = 94340
Step 107: 94340 + 890 = 95230
Step 108: 95230 + 890 = 96120
Step 109: 96120 + 890 = 97010
Step 110: 97010 + 890 = 97900
Step 111: 97900 + 890 = 98790
Step 112: 98790 + 890 = 99680
Step 113: 99680 + 890 = 100570
Step 114: 100570 + 890 = 101460
Step 115: 101460 + 890 = 102350
Step 116: 102350 + 890 = 103240
Step 117: 103240 + 890 = 104130
Step 118: 104130 + 890 = 105020
Step 119: 105020 + 890 = 105910
Step 120: 105910 + 890 = 106800
Step 121: 106800 + 890 = 107690
Step 122: 107690 + 890 = 108580
Step 123: 108580 + 890 = 109470
Step 124: 109470 + 890 = 110360
Step 125: 110360 + 890 = 111250
Step 126: 111250 + 890 = 112140
Step 127: 112140 + 890 = 113030
Step 128: 113030 + 890 = 113920
Step 129: 113920 + 890 = 114810
Step 130: 114810 + 890 = 115700
Step 131: 115700 + 890 = 116590
Step 132: 116590 + 890 = 117480
Step 133: 117480 + 890 = 118370
Step 134: 118370 + 890 = 119260
Step 135: 119260 + 890 = 120150
Step 136: 120150 + 890 = 121040
Step 137: 121040 + 890 = 121930
Step 138: 121930 + 890 = 122820
Step 139: 122820 + 890 = 123710
Step 140: 123710 + 890 = 124600
Step 141: 124600 + 890 = 125490
Step 142: 125490 + 890 = 126380
Step 143: 126380 + 890 = 127270
Step 144: 127270 + 890 = 128160
Step 145: 128160 + 890 = 129050
Step 146: 129050 + 890 = 129940
Step 147: 129940 + 890 = 130830
Step 148: 130830 + 890 = 131720
Step 149: 131720 + 890 = 132610
Step 150: 132610 + 890 = 133500
Step 151: 133500 + 890 = 134390
Step 152: 134390 + 890 = 135280
Step 153: 135280 + 890 = 136170
Step 154: 136170 + 890 = 137060
Step 155: 137060 + 890 = 137950
Step 156: 137950 + 890 = 138840
Step 157: 138840 + 890 = 139730

So, 890*157 = 139730