OK, let's work through this together. We're starting with 210 and we're going to multiply it by 348, which means we add 210 to itself 348 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
Step 156: 32550 + 210 = 32760
Step 157: 32760 + 210 = 32970
Step 158: 32970 + 210 = 33180
Step 159: 33180 + 210 = 33390
Step 160: 33390 + 210 = 33600
Step 161: 33600 + 210 = 33810
Step 162: 33810 + 210 = 34020
Step 163: 34020 + 210 = 34230
Step 164: 34230 + 210 = 34440
Step 165: 34440 + 210 = 34650
Step 166: 34650 + 210 = 34860
Step 167: 34860 + 210 = 35070
Step 168: 35070 + 210 = 35280
Step 169: 35280 + 210 = 35490
Step 170: 35490 + 210 = 35700
Step 171: 35700 + 210 = 35910
Step 172: 35910 + 210 = 36120
Step 173: 36120 + 210 = 36330
Step 174: 36330 + 210 = 36540
Step 175: 36540 + 210 = 36750
Step 176: 36750 + 210 = 36960
Step 177: 36960 + 210 = 37170
Step 178: 37170 + 210 = 37380
Step 179: 37380 + 210 = 37590
Step 180: 37590 + 210 = 37800
Step 181: 37800 + 210 = 38010
Step 182: 38010 + 210 = 38220
Step 183: 38220 + 210 = 38430
Step 184: 38430 + 210 = 38640
Step 185: 38640 + 210 = 38850
Step 186: 38850 + 210 = 39060
Step 187: 39060 + 210 = 39270
Step 188: 39270 + 210 = 39480
Step 189: 39480 + 210 = 39690
Step 190: 39690 + 210 = 39900
Step 191: 39900 + 210 = 40110
Step 192: 40110 + 210 = 40320
Step 193: 40320 + 210 = 40530
Step 194: 40530 + 210 = 40740
Step 195: 40740 + 210 = 40950
Step 196: 40950 + 210 = 41160
Step 197: 41160 + 210 = 41370
Step 198: 41370 + 210 = 41580
Step 199: 41580 + 210 = 41790
Step 200: 41790 + 210 = 42000
Step 201: 42000 + 210 = 42210
Step 202: 42210 + 210 = 42420
Step 203: 42420 + 210 = 42630
Step 204: 42630 + 210 = 42840
Step 205: 42840 + 210 = 43050
Step 206: 43050 + 210 = 43260
Step 207: 43260 + 210 = 43470
Step 208: 43470 + 210 = 43680
Step 209: 43680 + 210 = 43890
Step 210: 43890 + 210 = 44100
Step 211: 44100 + 210 = 44310
Step 212: 44310 + 210 = 44520
Step 213: 44520 + 210 = 44730
Step 214: 44730 + 210 = 44940
Step 215: 44940 + 210 = 45150
Step 216: 45150 + 210 = 45360
Step 217: 45360 + 210 = 45570
Step 218: 45570 + 210 = 45780
Step 219: 45780 + 210 = 45990
Step 220: 45990 + 210 = 46200
Step 221: 46200 + 210 = 46410
Step 222: 46410 + 210 = 46620
Step 223: 46620 + 210 = 46830
Step 224: 46830 + 210 = 47040
Step 225: 47040 + 210 = 47250
Step 226: 47250 + 210 = 47460
Step 227: 47460 + 210 = 47670
Step 228: 47670 + 210 = 47880
Step 229: 47880 + 210 = 48090
Step 230: 48090 + 210 = 48300
Step 231: 48300 + 210 = 48510
Step 232: 48510 + 210 = 48720
Step 233: 48720 + 210 = 48930
Step 234: 48930 + 210 = 49140
Step 235: 49140 + 210 = 49350
Step 236: 49350 + 210 = 49560
Step 237: 49560 + 210 = 49770
Step 238: 49770 + 210 = 49980
Step 239: 49980 + 210 = 50190
Step 240: 50190 + 210 = 50400
Step 241: 50400 + 210 = 50610
Step 242: 50610 + 210 = 50820
Step 243: 50820 + 210 = 51030
Step 244: 51030 + 210 = 51240
Step 245: 51240 + 210 = 51450
Step 246: 51450 + 210 = 51660
Step 247: 51660 + 210 = 51870
Step 248: 51870 + 210 = 52080
Step 249: 52080 + 210 = 52290
Step 250: 52290 + 210 = 52500
Step 251: 52500 + 210 = 52710
Step 252: 52710 + 210 = 52920
Step 253: 52920 + 210 = 53130
Step 254: 53130 + 210 = 53340
Step 255: 53340 + 210 = 53550
Step 256: 53550 + 210 = 53760
Step 257: 53760 + 210 = 53970
Step 258: 53970 + 210 = 54180
Step 259: 54180 + 210 = 54390
Step 260: 54390 + 210 = 54600
Step 261: 54600 + 210 = 54810
Step 262: 54810 + 210 = 55020
Step 263: 55020 + 210 = 55230
Step 264: 55230 + 210 = 55440
Step 265: 55440 + 210 = 55650
Step 266: 55650 + 210 = 55860
Step 267: 55860 + 210 = 56070
Step 268: 56070 + 210 = 56280
Step 269: 56280 + 210 = 56490
Step 270: 56490 + 210 = 56700
Step 271: 56700 + 210 = 56910
Step 272: 56910 + 210 = 57120
Step 273: 57120 + 210 = 57330
Step 274: 57330 + 210 = 57540
Step 275: 57540 + 210 = 57750
Step 276: 57750 + 210 = 57960
Step 277: 57960 + 210 = 58170
Step 278: 58170 + 210 = 58380
Step 279: 58380 + 210 = 58590
Step 280: 58590 + 210 = 58800
Step 281: 58800 + 210 = 59010
Step 282: 59010 + 210 = 59220
Step 283: 59220 + 210 = 59430
Step 284: 59430 + 210 = 59640
Step 285: 59640 + 210 = 59850
Step 286: 59850 + 210 = 60060
Step 287: 60060 + 210 = 60270
Step 288: 60270 + 210 = 60480
Step 289: 60480 + 210 = 60690
Step 290: 60690 + 210 = 60900
Step 291: 60900 + 210 = 61110
Step 292: 61110 + 210 = 61320
Step 293: 61320 + 210 = 61530
Step 294: 61530 + 210 = 61740
Step 295: 61740 + 210 = 61950
Step 296: 61950 + 210 = 62160
Step 297: 62160 + 210 = 62370
Step 298: 62370 + 210 = 62580
Step 299: 62580 + 210 = 62790
Step 300: 62790 + 210 = 63000
Step 301: 63000 + 210 = 63210
Step 302: 63210 + 210 = 63420
Step 303: 63420 + 210 = 63630
Step 304: 63630 + 210 = 63840
Step 305: 63840 + 210 = 64050
Step 306: 64050 + 210 = 64260
Step 307: 64260 + 210 = 64470
Step 308: 64470 + 210 = 64680
Step 309: 64680 + 210 = 64890
Step 310: 64890 + 210 = 65100
Step 311: 65100 + 210 = 65310
Step 312: 65310 + 210 = 65520
Step 313: 65520 + 210 = 65730
Step 314: 65730 + 210 = 65940
Step 315: 65940 + 210 = 66150
Step 316: 66150 + 210 = 66360
Step 317: 66360 + 210 = 66570
Step 318: 66570 + 210 = 66780
Step 319: 66780 + 210 = 66990
Step 320: 66990 + 210 = 67200
Step 321: 67200 + 210 = 67410
Step 322: 67410 + 210 = 67620
Step 323: 67620 + 210 = 67830
Step 324: 67830 + 210 = 68040
Step 325: 68040 + 210 = 68250
Step 326: 68250 + 210 = 68460
Step 327: 68460 + 210 = 68670
Step 328: 68670 + 210 = 68880
Step 329: 68880 + 210 = 69090
Step 330: 69090 + 210 = 69300
Step 331: 69300 + 210 = 69510
Step 332: 69510 + 210 = 69720
Step 333: 69720 + 210 = 69930
Step 334: 69930 + 210 = 70140
Step 335: 70140 + 210 = 70350
Step 336: 70350 + 210 = 70560
Step 337: 70560 + 210 = 70770
Step 338: 70770 + 210 = 70980
Step 339: 70980 + 210 = 71190
Step 340: 71190 + 210 = 71400
Step 341: 71400 + 210 = 71610
Step 342: 71610 + 210 = 71820
Step 343: 71820 + 210 = 72030
Step 344: 72030 + 210 = 72240
Step 345: 72240 + 210 = 72450
Step 346: 72450 + 210 = 72660
Step 347: 72660 + 210 = 72870
Step 348: 72870 + 210 = 73080

So, 210*348 = 73080