Alright, let's solve this math problem step by step. First, we have the number 420. Next, we see the multiplication sign, which means we need to multiply something. And what are we multiplying it by? We multiply it by 212. So, we're going to take the number 420 and add it to itself 212 times.
Step 1: 0 + 420 = 420
Step 2: 420 + 420 = 840
Step 3: 840 + 420 = 1260
Step 4: 1260 + 420 = 1680
Step 5: 1680 + 420 = 2100
Step 6: 2100 + 420 = 2520
Step 7: 2520 + 420 = 2940
Step 8: 2940 + 420 = 3360
Step 9: 3360 + 420 = 3780
Step 10: 3780 + 420 = 4200
Step 11: 4200 + 420 = 4620
Step 12: 4620 + 420 = 5040
Step 13: 5040 + 420 = 5460
Step 14: 5460 + 420 = 5880
Step 15: 5880 + 420 = 6300
Step 16: 6300 + 420 = 6720
Step 17: 6720 + 420 = 7140
Step 18: 7140 + 420 = 7560
Step 19: 7560 + 420 = 7980
Step 20: 7980 + 420 = 8400
Step 21: 8400 + 420 = 8820
Step 22: 8820 + 420 = 9240
Step 23: 9240 + 420 = 9660
Step 24: 9660 + 420 = 10080
Step 25: 10080 + 420 = 10500
Step 26: 10500 + 420 = 10920
Step 27: 10920 + 420 = 11340
Step 28: 11340 + 420 = 11760
Step 29: 11760 + 420 = 12180
Step 30: 12180 + 420 = 12600
Step 31: 12600 + 420 = 13020
Step 32: 13020 + 420 = 13440
Step 33: 13440 + 420 = 13860
Step 34: 13860 + 420 = 14280
Step 35: 14280 + 420 = 14700
Step 36: 14700 + 420 = 15120
Step 37: 15120 + 420 = 15540
Step 38: 15540 + 420 = 15960
Step 39: 15960 + 420 = 16380
Step 40: 16380 + 420 = 16800
Step 41: 16800 + 420 = 17220
Step 42: 17220 + 420 = 17640
Step 43: 17640 + 420 = 18060
Step 44: 18060 + 420 = 18480
Step 45: 18480 + 420 = 18900
Step 46: 18900 + 420 = 19320
Step 47: 19320 + 420 = 19740
Step 48: 19740 + 420 = 20160
Step 49: 20160 + 420 = 20580
Step 50: 20580 + 420 = 21000
Step 51: 21000 + 420 = 21420
Step 52: 21420 + 420 = 21840
Step 53: 21840 + 420 = 22260
Step 54: 22260 + 420 = 22680
Step 55: 22680 + 420 = 23100
Step 56: 23100 + 420 = 23520
Step 57: 23520 + 420 = 23940
Step 58: 23940 + 420 = 24360
Step 59: 24360 + 420 = 24780
Step 60: 24780 + 420 = 25200
Step 61: 25200 + 420 = 25620
Step 62: 25620 + 420 = 26040
Step 63: 26040 + 420 = 26460
Step 64: 26460 + 420 = 26880
Step 65: 26880 + 420 = 27300
Step 66: 27300 + 420 = 27720
Step 67: 27720 + 420 = 28140
Step 68: 28140 + 420 = 28560
Step 69: 28560 + 420 = 28980
Step 70: 28980 + 420 = 29400
Step 71: 29400 + 420 = 29820
Step 72: 29820 + 420 = 30240
Step 73: 30240 + 420 = 30660
Step 74: 30660 + 420 = 31080
Step 75: 31080 + 420 = 31500
Step 76: 31500 + 420 = 31920
Step 77: 31920 + 420 = 32340
Step 78: 32340 + 420 = 32760
Step 79: 32760 + 420 = 33180
Step 80: 33180 + 420 = 33600
Step 81: 33600 + 420 = 34020
Step 82: 34020 + 420 = 34440
Step 83: 34440 + 420 = 34860
Step 84: 34860 + 420 = 35280
Step 85: 35280 + 420 = 35700
Step 86: 35700 + 420 = 36120
Step 87: 36120 + 420 = 36540
Step 88: 36540 + 420 = 36960
Step 89: 36960 + 420 = 37380
Step 90: 37380 + 420 = 37800
Step 91: 37800 + 420 = 38220
Step 92: 38220 + 420 = 38640
Step 93: 38640 + 420 = 39060
Step 94: 39060 + 420 = 39480
Step 95: 39480 + 420 = 39900
Step 96: 39900 + 420 = 40320
Step 97: 40320 + 420 = 40740
Step 98: 40740 + 420 = 41160
Step 99: 41160 + 420 = 41580
Step 100: 41580 + 420 = 42000
Step 101: 42000 + 420 = 42420
Step 102: 42420 + 420 = 42840
Step 103: 42840 + 420 = 43260
Step 104: 43260 + 420 = 43680
Step 105: 43680 + 420 = 44100
Step 106: 44100 + 420 = 44520
Step 107: 44520 + 420 = 44940
Step 108: 44940 + 420 = 45360
Step 109: 45360 + 420 = 45780
Step 110: 45780 + 420 = 46200
Step 111: 46200 + 420 = 46620
Step 112: 46620 + 420 = 47040
Step 113: 47040 + 420 = 47460
Step 114: 47460 + 420 = 47880
Step 115: 47880 + 420 = 48300
Step 116: 48300 + 420 = 48720
Step 117: 48720 + 420 = 49140
Step 118: 49140 + 420 = 49560
Step 119: 49560 + 420 = 49980
Step 120: 49980 + 420 = 50400
Step 121: 50400 + 420 = 50820
Step 122: 50820 + 420 = 51240
Step 123: 51240 + 420 = 51660
Step 124: 51660 + 420 = 52080
Step 125: 52080 + 420 = 52500
Step 126: 52500 + 420 = 52920
Step 127: 52920 + 420 = 53340
Step 128: 53340 + 420 = 53760
Step 129: 53760 + 420 = 54180
Step 130: 54180 + 420 = 54600
Step 131: 54600 + 420 = 55020
Step 132: 55020 + 420 = 55440
Step 133: 55440 + 420 = 55860
Step 134: 55860 + 420 = 56280
Step 135: 56280 + 420 = 56700
Step 136: 56700 + 420 = 57120
Step 137: 57120 + 420 = 57540
Step 138: 57540 + 420 = 57960
Step 139: 57960 + 420 = 58380
Step 140: 58380 + 420 = 58800
Step 141: 58800 + 420 = 59220
Step 142: 59220 + 420 = 59640
Step 143: 59640 + 420 = 60060
Step 144: 60060 + 420 = 60480
Step 145: 60480 + 420 = 60900
Step 146: 60900 + 420 = 61320
Step 147: 61320 + 420 = 61740
Step 148: 61740 + 420 = 62160
Step 149: 62160 + 420 = 62580
Step 150: 62580 + 420 = 63000
Step 151: 63000 + 420 = 63420
Step 152: 63420 + 420 = 63840
Step 153: 63840 + 420 = 64260
Step 154: 64260 + 420 = 64680
Step 155: 64680 + 420 = 65100
Step 156: 65100 + 420 = 65520
Step 157: 65520 + 420 = 65940
Step 158: 65940 + 420 = 66360
Step 159: 66360 + 420 = 66780
Step 160: 66780 + 420 = 67200
Step 161: 67200 + 420 = 67620
Step 162: 67620 + 420 = 68040
Step 163: 68040 + 420 = 68460
Step 164: 68460 + 420 = 68880
Step 165: 68880 + 420 = 69300
Step 166: 69300 + 420 = 69720
Step 167: 69720 + 420 = 70140
Step 168: 70140 + 420 = 70560
Step 169: 70560 + 420 = 70980
Step 170: 70980 + 420 = 71400
Step 171: 71400 + 420 = 71820
Step 172: 71820 + 420 = 72240
Step 173: 72240 + 420 = 72660
Step 174: 72660 + 420 = 73080
Step 175: 73080 + 420 = 73500
Step 176: 73500 + 420 = 73920
Step 177: 73920 + 420 = 74340
Step 178: 74340 + 420 = 74760
Step 179: 74760 + 420 = 75180
Step 180: 75180 + 420 = 75600
Step 181: 75600 + 420 = 76020
Step 182: 76020 + 420 = 76440
Step 183: 76440 + 420 = 76860
Step 184: 76860 + 420 = 77280
Step 185: 77280 + 420 = 77700
Step 186: 77700 + 420 = 78120
Step 187: 78120 + 420 = 78540
Step 188: 78540 + 420 = 78960
Step 189: 78960 + 420 = 79380
Step 190: 79380 + 420 = 79800
Step 191: 79800 + 420 = 80220
Step 192: 80220 + 420 = 80640
Step 193: 80640 + 420 = 81060
Step 194: 81060 + 420 = 81480
Step 195: 81480 + 420 = 81900
Step 196: 81900 + 420 = 82320
Step 197: 82320 + 420 = 82740
Step 198: 82740 + 420 = 83160
Step 199: 83160 + 420 = 83580
Step 200: 83580 + 420 = 84000
Step 201: 84000 + 420 = 84420
Step 202: 84420 + 420 = 84840
Step 203: 84840 + 420 = 85260
Step 204: 85260 + 420 = 85680
Step 205: 85680 + 420 = 86100
Step 206: 86100 + 420 = 86520
Step 207: 86520 + 420 = 86940
Step 208: 86940 + 420 = 87360
Step 209: 87360 + 420 = 87780
Step 210: 87780 + 420 = 88200
Step 211: 88200 + 420 = 88620
Step 212: 88620 + 420 = 89040

So, 420*212 = 89040