Alright, let's solve this math problem step by step. First, we have the number 210. Next, we see the multiplication sign, which means we need to multiply something. And what are we multiplying it by? We multiply it by 155. So, we're going to take the number 210 and add it to itself 155 times.
Step 1: 0 + 210 = 210
Step 2: 210 + 210 = 420
Step 3: 420 + 210 = 630
Step 4: 630 + 210 = 840
Step 5: 840 + 210 = 1050
Step 6: 1050 + 210 = 1260
Step 7: 1260 + 210 = 1470
Step 8: 1470 + 210 = 1680
Step 9: 1680 + 210 = 1890
Step 10: 1890 + 210 = 2100
Step 11: 2100 + 210 = 2310
Step 12: 2310 + 210 = 2520
Step 13: 2520 + 210 = 2730
Step 14: 2730 + 210 = 2940
Step 15: 2940 + 210 = 3150
Step 16: 3150 + 210 = 3360
Step 17: 3360 + 210 = 3570
Step 18: 3570 + 210 = 3780
Step 19: 3780 + 210 = 3990
Step 20: 3990 + 210 = 4200
Step 21: 4200 + 210 = 4410
Step 22: 4410 + 210 = 4620
Step 23: 4620 + 210 = 4830
Step 24: 4830 + 210 = 5040
Step 25: 5040 + 210 = 5250
Step 26: 5250 + 210 = 5460
Step 27: 5460 + 210 = 5670
Step 28: 5670 + 210 = 5880
Step 29: 5880 + 210 = 6090
Step 30: 6090 + 210 = 6300
Step 31: 6300 + 210 = 6510
Step 32: 6510 + 210 = 6720
Step 33: 6720 + 210 = 6930
Step 34: 6930 + 210 = 7140
Step 35: 7140 + 210 = 7350
Step 36: 7350 + 210 = 7560
Step 37: 7560 + 210 = 7770
Step 38: 7770 + 210 = 7980
Step 39: 7980 + 210 = 8190
Step 40: 8190 + 210 = 8400
Step 41: 8400 + 210 = 8610
Step 42: 8610 + 210 = 8820
Step 43: 8820 + 210 = 9030
Step 44: 9030 + 210 = 9240
Step 45: 9240 + 210 = 9450
Step 46: 9450 + 210 = 9660
Step 47: 9660 + 210 = 9870
Step 48: 9870 + 210 = 10080
Step 49: 10080 + 210 = 10290
Step 50: 10290 + 210 = 10500
Step 51: 10500 + 210 = 10710
Step 52: 10710 + 210 = 10920
Step 53: 10920 + 210 = 11130
Step 54: 11130 + 210 = 11340
Step 55: 11340 + 210 = 11550
Step 56: 11550 + 210 = 11760
Step 57: 11760 + 210 = 11970
Step 58: 11970 + 210 = 12180
Step 59: 12180 + 210 = 12390
Step 60: 12390 + 210 = 12600
Step 61: 12600 + 210 = 12810
Step 62: 12810 + 210 = 13020
Step 63: 13020 + 210 = 13230
Step 64: 13230 + 210 = 13440
Step 65: 13440 + 210 = 13650
Step 66: 13650 + 210 = 13860
Step 67: 13860 + 210 = 14070
Step 68: 14070 + 210 = 14280
Step 69: 14280 + 210 = 14490
Step 70: 14490 + 210 = 14700
Step 71: 14700 + 210 = 14910
Step 72: 14910 + 210 = 15120
Step 73: 15120 + 210 = 15330
Step 74: 15330 + 210 = 15540
Step 75: 15540 + 210 = 15750
Step 76: 15750 + 210 = 15960
Step 77: 15960 + 210 = 16170
Step 78: 16170 + 210 = 16380
Step 79: 16380 + 210 = 16590
Step 80: 16590 + 210 = 16800
Step 81: 16800 + 210 = 17010
Step 82: 17010 + 210 = 17220
Step 83: 17220 + 210 = 17430
Step 84: 17430 + 210 = 17640
Step 85: 17640 + 210 = 17850
Step 86: 17850 + 210 = 18060
Step 87: 18060 + 210 = 18270
Step 88: 18270 + 210 = 18480
Step 89: 18480 + 210 = 18690
Step 90: 18690 + 210 = 18900
Step 91: 18900 + 210 = 19110
Step 92: 19110 + 210 = 19320
Step 93: 19320 + 210 = 19530
Step 94: 19530 + 210 = 19740
Step 95: 19740 + 210 = 19950
Step 96: 19950 + 210 = 20160
Step 97: 20160 + 210 = 20370
Step 98: 20370 + 210 = 20580
Step 99: 20580 + 210 = 20790
Step 100: 20790 + 210 = 21000
Step 101: 21000 + 210 = 21210
Step 102: 21210 + 210 = 21420
Step 103: 21420 + 210 = 21630
Step 104: 21630 + 210 = 21840
Step 105: 21840 + 210 = 22050
Step 106: 22050 + 210 = 22260
Step 107: 22260 + 210 = 22470
Step 108: 22470 + 210 = 22680
Step 109: 22680 + 210 = 22890
Step 110: 22890 + 210 = 23100
Step 111: 23100 + 210 = 23310
Step 112: 23310 + 210 = 23520
Step 113: 23520 + 210 = 23730
Step 114: 23730 + 210 = 23940
Step 115: 23940 + 210 = 24150
Step 116: 24150 + 210 = 24360
Step 117: 24360 + 210 = 24570
Step 118: 24570 + 210 = 24780
Step 119: 24780 + 210 = 24990
Step 120: 24990 + 210 = 25200
Step 121: 25200 + 210 = 25410
Step 122: 25410 + 210 = 25620
Step 123: 25620 + 210 = 25830
Step 124: 25830 + 210 = 26040
Step 125: 26040 + 210 = 26250
Step 126: 26250 + 210 = 26460
Step 127: 26460 + 210 = 26670
Step 128: 26670 + 210 = 26880
Step 129: 26880 + 210 = 27090
Step 130: 27090 + 210 = 27300
Step 131: 27300 + 210 = 27510
Step 132: 27510 + 210 = 27720
Step 133: 27720 + 210 = 27930
Step 134: 27930 + 210 = 28140
Step 135: 28140 + 210 = 28350
Step 136: 28350 + 210 = 28560
Step 137: 28560 + 210 = 28770
Step 138: 28770 + 210 = 28980
Step 139: 28980 + 210 = 29190
Step 140: 29190 + 210 = 29400
Step 141: 29400 + 210 = 29610
Step 142: 29610 + 210 = 29820
Step 143: 29820 + 210 = 30030
Step 144: 30030 + 210 = 30240
Step 145: 30240 + 210 = 30450
Step 146: 30450 + 210 = 30660
Step 147: 30660 + 210 = 30870
Step 148: 30870 + 210 = 31080
Step 149: 31080 + 210 = 31290
Step 150: 31290 + 210 = 31500
Step 151: 31500 + 210 = 31710
Step 152: 31710 + 210 = 31920
Step 153: 31920 + 210 = 32130
Step 154: 32130 + 210 = 32340
Step 155: 32340 + 210 = 32550

So, 210*155 = 32550