Alright, let's solve this math problem step by step. First, we have the number 355. Next, we see the multiplication sign, which means we need to multiply something. And what are we multiplying it by? We multiply it by 407. So, we're going to take the number 355 and add it to itself 407 times.
Step 1: 0 + 355 = 355
Step 2: 355 + 355 = 710
Step 3: 710 + 355 = 1065
Step 4: 1065 + 355 = 1420
Step 5: 1420 + 355 = 1775
Step 6: 1775 + 355 = 2130
Step 7: 2130 + 355 = 2485
Step 8: 2485 + 355 = 2840
Step 9: 2840 + 355 = 3195
Step 10: 3195 + 355 = 3550
Step 11: 3550 + 355 = 3905
Step 12: 3905 + 355 = 4260
Step 13: 4260 + 355 = 4615
Step 14: 4615 + 355 = 4970
Step 15: 4970 + 355 = 5325
Step 16: 5325 + 355 = 5680
Step 17: 5680 + 355 = 6035
Step 18: 6035 + 355 = 6390
Step 19: 6390 + 355 = 6745
Step 20: 6745 + 355 = 7100
Step 21: 7100 + 355 = 7455
Step 22: 7455 + 355 = 7810
Step 23: 7810 + 355 = 8165
Step 24: 8165 + 355 = 8520
Step 25: 8520 + 355 = 8875
Step 26: 8875 + 355 = 9230
Step 27: 9230 + 355 = 9585
Step 28: 9585 + 355 = 9940
Step 29: 9940 + 355 = 10295
Step 30: 10295 + 355 = 10650
Step 31: 10650 + 355 = 11005
Step 32: 11005 + 355 = 11360
Step 33: 11360 + 355 = 11715
Step 34: 11715 + 355 = 12070
Step 35: 12070 + 355 = 12425
Step 36: 12425 + 355 = 12780
Step 37: 12780 + 355 = 13135
Step 38: 13135 + 355 = 13490
Step 39: 13490 + 355 = 13845
Step 40: 13845 + 355 = 14200
Step 41: 14200 + 355 = 14555
Step 42: 14555 + 355 = 14910
Step 43: 14910 + 355 = 15265
Step 44: 15265 + 355 = 15620
Step 45: 15620 + 355 = 15975
Step 46: 15975 + 355 = 16330
Step 47: 16330 + 355 = 16685
Step 48: 16685 + 355 = 17040
Step 49: 17040 + 355 = 17395
Step 50: 17395 + 355 = 17750
Step 51: 17750 + 355 = 18105
Step 52: 18105 + 355 = 18460
Step 53: 18460 + 355 = 18815
Step 54: 18815 + 355 = 19170
Step 55: 19170 + 355 = 19525
Step 56: 19525 + 355 = 19880
Step 57: 19880 + 355 = 20235
Step 58: 20235 + 355 = 20590
Step 59: 20590 + 355 = 20945
Step 60: 20945 + 355 = 21300
Step 61: 21300 + 355 = 21655
Step 62: 21655 + 355 = 22010
Step 63: 22010 + 355 = 22365
Step 64: 22365 + 355 = 22720
Step 65: 22720 + 355 = 23075
Step 66: 23075 + 355 = 23430
Step 67: 23430 + 355 = 23785
Step 68: 23785 + 355 = 24140
Step 69: 24140 + 355 = 24495
Step 70: 24495 + 355 = 24850
Step 71: 24850 + 355 = 25205
Step 72: 25205 + 355 = 25560
Step 73: 25560 + 355 = 25915
Step 74: 25915 + 355 = 26270
Step 75: 26270 + 355 = 26625
Step 76: 26625 + 355 = 26980
Step 77: 26980 + 355 = 27335
Step 78: 27335 + 355 = 27690
Step 79: 27690 + 355 = 28045
Step 80: 28045 + 355 = 28400
Step 81: 28400 + 355 = 28755
Step 82: 28755 + 355 = 29110
Step 83: 29110 + 355 = 29465
Step 84: 29465 + 355 = 29820
Step 85: 29820 + 355 = 30175
Step 86: 30175 + 355 = 30530
Step 87: 30530 + 355 = 30885
Step 88: 30885 + 355 = 31240
Step 89: 31240 + 355 = 31595
Step 90: 31595 + 355 = 31950
Step 91: 31950 + 355 = 32305
Step 92: 32305 + 355 = 32660
Step 93: 32660 + 355 = 33015
Step 94: 33015 + 355 = 33370
Step 95: 33370 + 355 = 33725
Step 96: 33725 + 355 = 34080
Step 97: 34080 + 355 = 34435
Step 98: 34435 + 355 = 34790
Step 99: 34790 + 355 = 35145
Step 100: 35145 + 355 = 35500
Step 101: 35500 + 355 = 35855
Step 102: 35855 + 355 = 36210
Step 103: 36210 + 355 = 36565
Step 104: 36565 + 355 = 36920
Step 105: 36920 + 355 = 37275
Step 106: 37275 + 355 = 37630
Step 107: 37630 + 355 = 37985
Step 108: 37985 + 355 = 38340
Step 109: 38340 + 355 = 38695
Step 110: 38695 + 355 = 39050
Step 111: 39050 + 355 = 39405
Step 112: 39405 + 355 = 39760
Step 113: 39760 + 355 = 40115
Step 114: 40115 + 355 = 40470
Step 115: 40470 + 355 = 40825
Step 116: 40825 + 355 = 41180
Step 117: 41180 + 355 = 41535
Step 118: 41535 + 355 = 41890
Step 119: 41890 + 355 = 42245
Step 120: 42245 + 355 = 42600
Step 121: 42600 + 355 = 42955
Step 122: 42955 + 355 = 43310
Step 123: 43310 + 355 = 43665
Step 124: 43665 + 355 = 44020
Step 125: 44020 + 355 = 44375
Step 126: 44375 + 355 = 44730
Step 127: 44730 + 355 = 45085
Step 128: 45085 + 355 = 45440
Step 129: 45440 + 355 = 45795
Step 130: 45795 + 355 = 46150
Step 131: 46150 + 355 = 46505
Step 132: 46505 + 355 = 46860
Step 133: 46860 + 355 = 47215
Step 134: 47215 + 355 = 47570
Step 135: 47570 + 355 = 47925
Step 136: 47925 + 355 = 48280
Step 137: 48280 + 355 = 48635
Step 138: 48635 + 355 = 48990
Step 139: 48990 + 355 = 49345
Step 140: 49345 + 355 = 49700
Step 141: 49700 + 355 = 50055
Step 142: 50055 + 355 = 50410
Step 143: 50410 + 355 = 50765
Step 144: 50765 + 355 = 51120
Step 145: 51120 + 355 = 51475
Step 146: 51475 + 355 = 51830
Step 147: 51830 + 355 = 52185
Step 148: 52185 + 355 = 52540
Step 149: 52540 + 355 = 52895
Step 150: 52895 + 355 = 53250
Step 151: 53250 + 355 = 53605
Step 152: 53605 + 355 = 53960
Step 153: 53960 + 355 = 54315
Step 154: 54315 + 355 = 54670
Step 155: 54670 + 355 = 55025
Step 156: 55025 + 355 = 55380
Step 157: 55380 + 355 = 55735
Step 158: 55735 + 355 = 56090
Step 159: 56090 + 355 = 56445
Step 160: 56445 + 355 = 56800
Step 161: 56800 + 355 = 57155
Step 162: 57155 + 355 = 57510
Step 163: 57510 + 355 = 57865
Step 164: 57865 + 355 = 58220
Step 165: 58220 + 355 = 58575
Step 166: 58575 + 355 = 58930
Step 167: 58930 + 355 = 59285
Step 168: 59285 + 355 = 59640
Step 169: 59640 + 355 = 59995
Step 170: 59995 + 355 = 60350
Step 171: 60350 + 355 = 60705
Step 172: 60705 + 355 = 61060
Step 173: 61060 + 355 = 61415
Step 174: 61415 + 355 = 61770
Step 175: 61770 + 355 = 62125
Step 176: 62125 + 355 = 62480
Step 177: 62480 + 355 = 62835
Step 178: 62835 + 355 = 63190
Step 179: 63190 + 355 = 63545
Step 180: 63545 + 355 = 63900
Step 181: 63900 + 355 = 64255
Step 182: 64255 + 355 = 64610
Step 183: 64610 + 355 = 64965
Step 184: 64965 + 355 = 65320
Step 185: 65320 + 355 = 65675
Step 186: 65675 + 355 = 66030
Step 187: 66030 + 355 = 66385
Step 188: 66385 + 355 = 66740
Step 189: 66740 + 355 = 67095
Step 190: 67095 + 355 = 67450
Step 191: 67450 + 355 = 67805
Step 192: 67805 + 355 = 68160
Step 193: 68160 + 355 = 68515
Step 194: 68515 + 355 = 68870
Step 195: 68870 + 355 = 69225
Step 196: 69225 + 355 = 69580
Step 197: 69580 + 355 = 69935
Step 198: 69935 + 355 = 70290
Step 199: 70290 + 355 = 70645
Step 200: 70645 + 355 = 71000
Step 201: 71000 + 355 = 71355
Step 202: 71355 + 355 = 71710
Step 203: 71710 + 355 = 72065
Step 204: 72065 + 355 = 72420
Step 205: 72420 + 355 = 72775
Step 206: 72775 + 355 = 73130
Step 207: 73130 + 355 = 73485
Step 208: 73485 + 355 = 73840
Step 209: 73840 + 355 = 74195
Step 210: 74195 + 355 = 74550
Step 211: 74550 + 355 = 74905
Step 212: 74905 + 355 = 75260
Step 213: 75260 + 355 = 75615
Step 214: 75615 + 355 = 75970
Step 215: 75970 + 355 = 76325
Step 216: 76325 + 355 = 76680
Step 217: 76680 + 355 = 77035
Step 218: 77035 + 355 = 77390
Step 219: 77390 + 355 = 77745
Step 220: 77745 + 355 = 78100
Step 221: 78100 + 355 = 78455
Step 222: 78455 + 355 = 78810
Step 223: 78810 + 355 = 79165
Step 224: 79165 + 355 = 79520
Step 225: 79520 + 355 = 79875
Step 226: 79875 + 355 = 80230
Step 227: 80230 + 355 = 80585
Step 228: 80585 + 355 = 80940
Step 229: 80940 + 355 = 81295
Step 230: 81295 + 355 = 81650
Step 231: 81650 + 355 = 82005
Step 232: 82005 + 355 = 82360
Step 233: 82360 + 355 = 82715
Step 234: 82715 + 355 = 83070
Step 235: 83070 + 355 = 83425
Step 236: 83425 + 355 = 83780
Step 237: 83780 + 355 = 84135
Step 238: 84135 + 355 = 84490
Step 239: 84490 + 355 = 84845
Step 240: 84845 + 355 = 85200
Step 241: 85200 + 355 = 85555
Step 242: 85555 + 355 = 85910
Step 243: 85910 + 355 = 86265
Step 244: 86265 + 355 = 86620
Step 245: 86620 + 355 = 86975
Step 246: 86975 + 355 = 87330
Step 247: 87330 + 355 = 87685
Step 248: 87685 + 355 = 88040
Step 249: 88040 + 355 = 88395
Step 250: 88395 + 355 = 88750
Step 251: 88750 + 355 = 89105
Step 252: 89105 + 355 = 89460
Step 253: 89460 + 355 = 89815
Step 254: 89815 + 355 = 90170
Step 255: 90170 + 355 = 90525
Step 256: 90525 + 355 = 90880
Step 257: 90880 + 355 = 91235
Step 258: 91235 + 355 = 91590
Step 259: 91590 + 355 = 91945
Step 260: 91945 + 355 = 92300
Step 261: 92300 + 355 = 92655
Step 262: 92655 + 355 = 93010
Step 263: 93010 + 355 = 93365
Step 264: 93365 + 355 = 93720
Step 265: 93720 + 355 = 94075
Step 266: 94075 + 355 = 94430
Step 267: 94430 + 355 = 94785
Step 268: 94785 + 355 = 95140
Step 269: 95140 + 355 = 95495
Step 270: 95495 + 355 = 95850
Step 271: 95850 + 355 = 96205
Step 272: 96205 + 355 = 96560
Step 273: 96560 + 355 = 96915
Step 274: 96915 + 355 = 97270
Step 275: 97270 + 355 = 97625
Step 276: 97625 + 355 = 97980
Step 277: 97980 + 355 = 98335
Step 278: 98335 + 355 = 98690
Step 279: 98690 + 355 = 99045
Step 280: 99045 + 355 = 99400
Step 281: 99400 + 355 = 99755
Step 282: 99755 + 355 = 100110
Step 283: 100110 + 355 = 100465
Step 284: 100465 + 355 = 100820
Step 285: 100820 + 355 = 101175
Step 286: 101175 + 355 = 101530
Step 287: 101530 + 355 = 101885
Step 288: 101885 + 355 = 102240
Step 289: 102240 + 355 = 102595
Step 290: 102595 + 355 = 102950
Step 291: 102950 + 355 = 103305
Step 292: 103305 + 355 = 103660
Step 293: 103660 + 355 = 104015
Step 294: 104015 + 355 = 104370
Step 295: 104370 + 355 = 104725
Step 296: 104725 + 355 = 105080
Step 297: 105080 + 355 = 105435
Step 298: 105435 + 355 = 105790
Step 299: 105790 + 355 = 106145
Step 300: 106145 + 355 = 106500
Step 301: 106500 + 355 = 106855
Step 302: 106855 + 355 = 107210
Step 303: 107210 + 355 = 107565
Step 304: 107565 + 355 = 107920
Step 305: 107920 + 355 = 108275
Step 306: 108275 + 355 = 108630
Step 307: 108630 + 355 = 108985
Step 308: 108985 + 355 = 109340
Step 309: 109340 + 355 = 109695
Step 310: 109695 + 355 = 110050
Step 311: 110050 + 355 = 110405
Step 312: 110405 + 355 = 110760
Step 313: 110760 + 355 = 111115
Step 314: 111115 + 355 = 111470
Step 315: 111470 + 355 = 111825
Step 316: 111825 + 355 = 112180
Step 317: 112180 + 355 = 112535
Step 318: 112535 + 355 = 112890
Step 319: 112890 + 355 = 113245
Step 320: 113245 + 355 = 113600
Step 321: 113600 + 355 = 113955
Step 322: 113955 + 355 = 114310
Step 323: 114310 + 355 = 114665
Step 324: 114665 + 355 = 115020
Step 325: 115020 + 355 = 115375
Step 326: 115375 + 355 = 115730
Step 327: 115730 + 355 = 116085
Step 328: 116085 + 355 = 116440
Step 329: 116440 + 355 = 116795
Step 330: 116795 + 355 = 117150
Step 331: 117150 + 355 = 117505
Step 332: 117505 + 355 = 117860
Step 333: 117860 + 355 = 118215
Step 334: 118215 + 355 = 118570
Step 335: 118570 + 355 = 118925
Step 336: 118925 + 355 = 119280
Step 337: 119280 + 355 = 119635
Step 338: 119635 + 355 = 119990
Step 339: 119990 + 355 = 120345
Step 340: 120345 + 355 = 120700
Step 341: 120700 + 355 = 121055
Step 342: 121055 + 355 = 121410
Step 343: 121410 + 355 = 121765
Step 344: 121765 + 355 = 122120
Step 345: 122120 + 355 = 122475
Step 346: 122475 + 355 = 122830
Step 347: 122830 + 355 = 123185
Step 348: 123185 + 355 = 123540
Step 349: 123540 + 355 = 123895
Step 350: 123895 + 355 = 124250
Step 351: 124250 + 355 = 124605
Step 352: 124605 + 355 = 124960
Step 353: 124960 + 355 = 125315
Step 354: 125315 + 355 = 125670
Step 355: 125670 + 355 = 126025
Step 356: 126025 + 355 = 126380
Step 357: 126380 + 355 = 126735
Step 358: 126735 + 355 = 127090
Step 359: 127090 + 355 = 127445
Step 360: 127445 + 355 = 127800
Step 361: 127800 + 355 = 128155
Step 362: 128155 + 355 = 128510
Step 363: 128510 + 355 = 128865
Step 364: 128865 + 355 = 129220
Step 365: 129220 + 355 = 129575
Step 366: 129575 + 355 = 129930
Step 367: 129930 + 355 = 130285
Step 368: 130285 + 355 = 130640
Step 369: 130640 + 355 = 130995
Step 370: 130995 + 355 = 131350
Step 371: 131350 + 355 = 131705
Step 372: 131705 + 355 = 132060
Step 373: 132060 + 355 = 132415
Step 374: 132415 + 355 = 132770
Step 375: 132770 + 355 = 133125
Step 376: 133125 + 355 = 133480
Step 377: 133480 + 355 = 133835
Step 378: 133835 + 355 = 134190
Step 379: 134190 + 355 = 134545
Step 380: 134545 + 355 = 134900
Step 381: 134900 + 355 = 135255
Step 382: 135255 + 355 = 135610
Step 383: 135610 + 355 = 135965
Step 384: 135965 + 355 = 136320
Step 385: 136320 + 355 = 136675
Step 386: 136675 + 355 = 137030
Step 387: 137030 + 355 = 137385
Step 388: 137385 + 355 = 137740
Step 389: 137740 + 355 = 138095
Step 390: 138095 + 355 = 138450
Step 391: 138450 + 355 = 138805
Step 392: 138805 + 355 = 139160
Step 393: 139160 + 355 = 139515
Step 394: 139515 + 355 = 139870
Step 395: 139870 + 355 = 140225
Step 396: 140225 + 355 = 140580
Step 397: 140580 + 355 = 140935
Step 398: 140935 + 355 = 141290
Step 399: 141290 + 355 = 141645
Step 400: 141645 + 355 = 142000
Step 401: 142000 + 355 = 142355
Step 402: 142355 + 355 = 142710
Step 403: 142710 + 355 = 143065
Step 404: 143065 + 355 = 143420
Step 405: 143420 + 355 = 143775
Step 406: 143775 + 355 = 144130
Step 407: 144130 + 355 = 144485

So, 355*407 = 144485