Sure thing, let's get straight to it. We start with 620 and we're going to multiply it by 398, which means adding 620 to itself 398 times.
Step 1: 0 + 620 = 620
Step 2: 620 + 620 = 1240
Step 3: 1240 + 620 = 1860
Step 4: 1860 + 620 = 2480
Step 5: 2480 + 620 = 3100
Step 6: 3100 + 620 = 3720
Step 7: 3720 + 620 = 4340
Step 8: 4340 + 620 = 4960
Step 9: 4960 + 620 = 5580
Step 10: 5580 + 620 = 6200
Step 11: 6200 + 620 = 6820
Step 12: 6820 + 620 = 7440
Step 13: 7440 + 620 = 8060
Step 14: 8060 + 620 = 8680
Step 15: 8680 + 620 = 9300
Step 16: 9300 + 620 = 9920
Step 17: 9920 + 620 = 10540
Step 18: 10540 + 620 = 11160
Step 19: 11160 + 620 = 11780
Step 20: 11780 + 620 = 12400
Step 21: 12400 + 620 = 13020
Step 22: 13020 + 620 = 13640
Step 23: 13640 + 620 = 14260
Step 24: 14260 + 620 = 14880
Step 25: 14880 + 620 = 15500
Step 26: 15500 + 620 = 16120
Step 27: 16120 + 620 = 16740
Step 28: 16740 + 620 = 17360
Step 29: 17360 + 620 = 17980
Step 30: 17980 + 620 = 18600
Step 31: 18600 + 620 = 19220
Step 32: 19220 + 620 = 19840
Step 33: 19840 + 620 = 20460
Step 34: 20460 + 620 = 21080
Step 35: 21080 + 620 = 21700
Step 36: 21700 + 620 = 22320
Step 37: 22320 + 620 = 22940
Step 38: 22940 + 620 = 23560
Step 39: 23560 + 620 = 24180
Step 40: 24180 + 620 = 24800
Step 41: 24800 + 620 = 25420
Step 42: 25420 + 620 = 26040
Step 43: 26040 + 620 = 26660
Step 44: 26660 + 620 = 27280
Step 45: 27280 + 620 = 27900
Step 46: 27900 + 620 = 28520
Step 47: 28520 + 620 = 29140
Step 48: 29140 + 620 = 29760
Step 49: 29760 + 620 = 30380
Step 50: 30380 + 620 = 31000
Step 51: 31000 + 620 = 31620
Step 52: 31620 + 620 = 32240
Step 53: 32240 + 620 = 32860
Step 54: 32860 + 620 = 33480
Step 55: 33480 + 620 = 34100
Step 56: 34100 + 620 = 34720
Step 57: 34720 + 620 = 35340
Step 58: 35340 + 620 = 35960
Step 59: 35960 + 620 = 36580
Step 60: 36580 + 620 = 37200
Step 61: 37200 + 620 = 37820
Step 62: 37820 + 620 = 38440
Step 63: 38440 + 620 = 39060
Step 64: 39060 + 620 = 39680
Step 65: 39680 + 620 = 40300
Step 66: 40300 + 620 = 40920
Step 67: 40920 + 620 = 41540
Step 68: 41540 + 620 = 42160
Step 69: 42160 + 620 = 42780
Step 70: 42780 + 620 = 43400
Step 71: 43400 + 620 = 44020
Step 72: 44020 + 620 = 44640
Step 73: 44640 + 620 = 45260
Step 74: 45260 + 620 = 45880
Step 75: 45880 + 620 = 46500
Step 76: 46500 + 620 = 47120
Step 77: 47120 + 620 = 47740
Step 78: 47740 + 620 = 48360
Step 79: 48360 + 620 = 48980
Step 80: 48980 + 620 = 49600
Step 81: 49600 + 620 = 50220
Step 82: 50220 + 620 = 50840
Step 83: 50840 + 620 = 51460
Step 84: 51460 + 620 = 52080
Step 85: 52080 + 620 = 52700
Step 86: 52700 + 620 = 53320
Step 87: 53320 + 620 = 53940
Step 88: 53940 + 620 = 54560
Step 89: 54560 + 620 = 55180
Step 90: 55180 + 620 = 55800
Step 91: 55800 + 620 = 56420
Step 92: 56420 + 620 = 57040
Step 93: 57040 + 620 = 57660
Step 94: 57660 + 620 = 58280
Step 95: 58280 + 620 = 58900
Step 96: 58900 + 620 = 59520
Step 97: 59520 + 620 = 60140
Step 98: 60140 + 620 = 60760
Step 99: 60760 + 620 = 61380
Step 100: 61380 + 620 = 62000
Step 101: 62000 + 620 = 62620
Step 102: 62620 + 620 = 63240
Step 103: 63240 + 620 = 63860
Step 104: 63860 + 620 = 64480
Step 105: 64480 + 620 = 65100
Step 106: 65100 + 620 = 65720
Step 107: 65720 + 620 = 66340
Step 108: 66340 + 620 = 66960
Step 109: 66960 + 620 = 67580
Step 110: 67580 + 620 = 68200
Step 111: 68200 + 620 = 68820
Step 112: 68820 + 620 = 69440
Step 113: 69440 + 620 = 70060
Step 114: 70060 + 620 = 70680
Step 115: 70680 + 620 = 71300
Step 116: 71300 + 620 = 71920
Step 117: 71920 + 620 = 72540
Step 118: 72540 + 620 = 73160
Step 119: 73160 + 620 = 73780
Step 120: 73780 + 620 = 74400
Step 121: 74400 + 620 = 75020
Step 122: 75020 + 620 = 75640
Step 123: 75640 + 620 = 76260
Step 124: 76260 + 620 = 76880
Step 125: 76880 + 620 = 77500
Step 126: 77500 + 620 = 78120
Step 127: 78120 + 620 = 78740
Step 128: 78740 + 620 = 79360
Step 129: 79360 + 620 = 79980
Step 130: 79980 + 620 = 80600
Step 131: 80600 + 620 = 81220
Step 132: 81220 + 620 = 81840
Step 133: 81840 + 620 = 82460
Step 134: 82460 + 620 = 83080
Step 135: 83080 + 620 = 83700
Step 136: 83700 + 620 = 84320
Step 137: 84320 + 620 = 84940
Step 138: 84940 + 620 = 85560
Step 139: 85560 + 620 = 86180
Step 140: 86180 + 620 = 86800
Step 141: 86800 + 620 = 87420
Step 142: 87420 + 620 = 88040
Step 143: 88040 + 620 = 88660
Step 144: 88660 + 620 = 89280
Step 145: 89280 + 620 = 89900
Step 146: 89900 + 620 = 90520
Step 147: 90520 + 620 = 91140
Step 148: 91140 + 620 = 91760
Step 149: 91760 + 620 = 92380
Step 150: 92380 + 620 = 93000
Step 151: 93000 + 620 = 93620
Step 152: 93620 + 620 = 94240
Step 153: 94240 + 620 = 94860
Step 154: 94860 + 620 = 95480
Step 155: 95480 + 620 = 96100
Step 156: 96100 + 620 = 96720
Step 157: 96720 + 620 = 97340
Step 158: 97340 + 620 = 97960
Step 159: 97960 + 620 = 98580
Step 160: 98580 + 620 = 99200
Step 161: 99200 + 620 = 99820
Step 162: 99820 + 620 = 100440
Step 163: 100440 + 620 = 101060
Step 164: 101060 + 620 = 101680
Step 165: 101680 + 620 = 102300
Step 166: 102300 + 620 = 102920
Step 167: 102920 + 620 = 103540
Step 168: 103540 + 620 = 104160
Step 169: 104160 + 620 = 104780
Step 170: 104780 + 620 = 105400
Step 171: 105400 + 620 = 106020
Step 172: 106020 + 620 = 106640
Step 173: 106640 + 620 = 107260
Step 174: 107260 + 620 = 107880
Step 175: 107880 + 620 = 108500
Step 176: 108500 + 620 = 109120
Step 177: 109120 + 620 = 109740
Step 178: 109740 + 620 = 110360
Step 179: 110360 + 620 = 110980
Step 180: 110980 + 620 = 111600
Step 181: 111600 + 620 = 112220
Step 182: 112220 + 620 = 112840
Step 183: 112840 + 620 = 113460
Step 184: 113460 + 620 = 114080
Step 185: 114080 + 620 = 114700
Step 186: 114700 + 620 = 115320
Step 187: 115320 + 620 = 115940
Step 188: 115940 + 620 = 116560
Step 189: 116560 + 620 = 117180
Step 190: 117180 + 620 = 117800
Step 191: 117800 + 620 = 118420
Step 192: 118420 + 620 = 119040
Step 193: 119040 + 620 = 119660
Step 194: 119660 + 620 = 120280
Step 195: 120280 + 620 = 120900
Step 196: 120900 + 620 = 121520
Step 197: 121520 + 620 = 122140
Step 198: 122140 + 620 = 122760
Step 199: 122760 + 620 = 123380
Step 200: 123380 + 620 = 124000
Step 201: 124000 + 620 = 124620
Step 202: 124620 + 620 = 125240
Step 203: 125240 + 620 = 125860
Step 204: 125860 + 620 = 126480
Step 205: 126480 + 620 = 127100
Step 206: 127100 + 620 = 127720
Step 207: 127720 + 620 = 128340
Step 208: 128340 + 620 = 128960
Step 209: 128960 + 620 = 129580
Step 210: 129580 + 620 = 130200
Step 211: 130200 + 620 = 130820
Step 212: 130820 + 620 = 131440
Step 213: 131440 + 620 = 132060
Step 214: 132060 + 620 = 132680
Step 215: 132680 + 620 = 133300
Step 216: 133300 + 620 = 133920
Step 217: 133920 + 620 = 134540
Step 218: 134540 + 620 = 135160
Step 219: 135160 + 620 = 135780
Step 220: 135780 + 620 = 136400
Step 221: 136400 + 620 = 137020
Step 222: 137020 + 620 = 137640
Step 223: 137640 + 620 = 138260
Step 224: 138260 + 620 = 138880
Step 225: 138880 + 620 = 139500
Step 226: 139500 + 620 = 140120
Step 227: 140120 + 620 = 140740
Step 228: 140740 + 620 = 141360
Step 229: 141360 + 620 = 141980
Step 230: 141980 + 620 = 142600
Step 231: 142600 + 620 = 143220
Step 232: 143220 + 620 = 143840
Step 233: 143840 + 620 = 144460
Step 234: 144460 + 620 = 145080
Step 235: 145080 + 620 = 145700
Step 236: 145700 + 620 = 146320
Step 237: 146320 + 620 = 146940
Step 238: 146940 + 620 = 147560
Step 239: 147560 + 620 = 148180
Step 240: 148180 + 620 = 148800
Step 241: 148800 + 620 = 149420
Step 242: 149420 + 620 = 150040
Step 243: 150040 + 620 = 150660
Step 244: 150660 + 620 = 151280
Step 245: 151280 + 620 = 151900
Step 246: 151900 + 620 = 152520
Step 247: 152520 + 620 = 153140
Step 248: 153140 + 620 = 153760
Step 249: 153760 + 620 = 154380
Step 250: 154380 + 620 = 155000
Step 251: 155000 + 620 = 155620
Step 252: 155620 + 620 = 156240
Step 253: 156240 + 620 = 156860
Step 254: 156860 + 620 = 157480
Step 255: 157480 + 620 = 158100
Step 256: 158100 + 620 = 158720
Step 257: 158720 + 620 = 159340
Step 258: 159340 + 620 = 159960
Step 259: 159960 + 620 = 160580
Step 260: 160580 + 620 = 161200
Step 261: 161200 + 620 = 161820
Step 262: 161820 + 620 = 162440
Step 263: 162440 + 620 = 163060
Step 264: 163060 + 620 = 163680
Step 265: 163680 + 620 = 164300
Step 266: 164300 + 620 = 164920
Step 267: 164920 + 620 = 165540
Step 268: 165540 + 620 = 166160
Step 269: 166160 + 620 = 166780
Step 270: 166780 + 620 = 167400
Step 271: 167400 + 620 = 168020
Step 272: 168020 + 620 = 168640
Step 273: 168640 + 620 = 169260
Step 274: 169260 + 620 = 169880
Step 275: 169880 + 620 = 170500
Step 276: 170500 + 620 = 171120
Step 277: 171120 + 620 = 171740
Step 278: 171740 + 620 = 172360
Step 279: 172360 + 620 = 172980
Step 280: 172980 + 620 = 173600
Step 281: 173600 + 620 = 174220
Step 282: 174220 + 620 = 174840
Step 283: 174840 + 620 = 175460
Step 284: 175460 + 620 = 176080
Step 285: 176080 + 620 = 176700
Step 286: 176700 + 620 = 177320
Step 287: 177320 + 620 = 177940
Step 288: 177940 + 620 = 178560
Step 289: 178560 + 620 = 179180
Step 290: 179180 + 620 = 179800
Step 291: 179800 + 620 = 180420
Step 292: 180420 + 620 = 181040
Step 293: 181040 + 620 = 181660
Step 294: 181660 + 620 = 182280
Step 295: 182280 + 620 = 182900
Step 296: 182900 + 620 = 183520
Step 297: 183520 + 620 = 184140
Step 298: 184140 + 620 = 184760
Step 299: 184760 + 620 = 185380
Step 300: 185380 + 620 = 186000
Step 301: 186000 + 620 = 186620
Step 302: 186620 + 620 = 187240
Step 303: 187240 + 620 = 187860
Step 304: 187860 + 620 = 188480
Step 305: 188480 + 620 = 189100
Step 306: 189100 + 620 = 189720
Step 307: 189720 + 620 = 190340
Step 308: 190340 + 620 = 190960
Step 309: 190960 + 620 = 191580
Step 310: 191580 + 620 = 192200
Step 311: 192200 + 620 = 192820
Step 312: 192820 + 620 = 193440
Step 313: 193440 + 620 = 194060
Step 314: 194060 + 620 = 194680
Step 315: 194680 + 620 = 195300
Step 316: 195300 + 620 = 195920
Step 317: 195920 + 620 = 196540
Step 318: 196540 + 620 = 197160
Step 319: 197160 + 620 = 197780
Step 320: 197780 + 620 = 198400
Step 321: 198400 + 620 = 199020
Step 322: 199020 + 620 = 199640
Step 323: 199640 + 620 = 200260
Step 324: 200260 + 620 = 200880
Step 325: 200880 + 620 = 201500
Step 326: 201500 + 620 = 202120
Step 327: 202120 + 620 = 202740
Step 328: 202740 + 620 = 203360
Step 329: 203360 + 620 = 203980
Step 330: 203980 + 620 = 204600
Step 331: 204600 + 620 = 205220
Step 332: 205220 + 620 = 205840
Step 333: 205840 + 620 = 206460
Step 334: 206460 + 620 = 207080
Step 335: 207080 + 620 = 207700
Step 336: 207700 + 620 = 208320
Step 337: 208320 + 620 = 208940
Step 338: 208940 + 620 = 209560
Step 339: 209560 + 620 = 210180
Step 340: 210180 + 620 = 210800
Step 341: 210800 + 620 = 211420
Step 342: 211420 + 620 = 212040
Step 343: 212040 + 620 = 212660
Step 344: 212660 + 620 = 213280
Step 345: 213280 + 620 = 213900
Step 346: 213900 + 620 = 214520
Step 347: 214520 + 620 = 215140
Step 348: 215140 + 620 = 215760
Step 349: 215760 + 620 = 216380
Step 350: 216380 + 620 = 217000
Step 351: 217000 + 620 = 217620
Step 352: 217620 + 620 = 218240
Step 353: 218240 + 620 = 218860
Step 354: 218860 + 620 = 219480
Step 355: 219480 + 620 = 220100
Step 356: 220100 + 620 = 220720
Step 357: 220720 + 620 = 221340
Step 358: 221340 + 620 = 221960
Step 359: 221960 + 620 = 222580
Step 360: 222580 + 620 = 223200
Step 361: 223200 + 620 = 223820
Step 362: 223820 + 620 = 224440
Step 363: 224440 + 620 = 225060
Step 364: 225060 + 620 = 225680
Step 365: 225680 + 620 = 226300
Step 366: 226300 + 620 = 226920
Step 367: 226920 + 620 = 227540
Step 368: 227540 + 620 = 228160
Step 369: 228160 + 620 = 228780
Step 370: 228780 + 620 = 229400
Step 371: 229400 + 620 = 230020
Step 372: 230020 + 620 = 230640
Step 373: 230640 + 620 = 231260
Step 374: 231260 + 620 = 231880
Step 375: 231880 + 620 = 232500
Step 376: 232500 + 620 = 233120
Step 377: 233120 + 620 = 233740
Step 378: 233740 + 620 = 234360
Step 379: 234360 + 620 = 234980
Step 380: 234980 + 620 = 235600
Step 381: 235600 + 620 = 236220
Step 382: 236220 + 620 = 236840
Step 383: 236840 + 620 = 237460
Step 384: 237460 + 620 = 238080
Step 385: 238080 + 620 = 238700
Step 386: 238700 + 620 = 239320
Step 387: 239320 + 620 = 239940
Step 388: 239940 + 620 = 240560
Step 389: 240560 + 620 = 241180
Step 390: 241180 + 620 = 241800
Step 391: 241800 + 620 = 242420
Step 392: 242420 + 620 = 243040
Step 393: 243040 + 620 = 243660
Step 394: 243660 + 620 = 244280
Step 395: 244280 + 620 = 244900
Step 396: 244900 + 620 = 245520
Step 397: 245520 + 620 = 246140
Step 398: 246140 + 620 = 246760

So, 620*398 = 246760