Sure thing, let's get straight to it. We start with 143 and we're going to multiply it by 345, which means adding 143 to itself 345 times.
Step 1: 0 + 143 = 143
Step 2: 143 + 143 = 286
Step 3: 286 + 143 = 429
Step 4: 429 + 143 = 572
Step 5: 572 + 143 = 715
Step 6: 715 + 143 = 858
Step 7: 858 + 143 = 1001
Step 8: 1001 + 143 = 1144
Step 9: 1144 + 143 = 1287
Step 10: 1287 + 143 = 1430
Step 11: 1430 + 143 = 1573
Step 12: 1573 + 143 = 1716
Step 13: 1716 + 143 = 1859
Step 14: 1859 + 143 = 2002
Step 15: 2002 + 143 = 2145
Step 16: 2145 + 143 = 2288
Step 17: 2288 + 143 = 2431
Step 18: 2431 + 143 = 2574
Step 19: 2574 + 143 = 2717
Step 20: 2717 + 143 = 2860
Step 21: 2860 + 143 = 3003
Step 22: 3003 + 143 = 3146
Step 23: 3146 + 143 = 3289
Step 24: 3289 + 143 = 3432
Step 25: 3432 + 143 = 3575
Step 26: 3575 + 143 = 3718
Step 27: 3718 + 143 = 3861
Step 28: 3861 + 143 = 4004
Step 29: 4004 + 143 = 4147
Step 30: 4147 + 143 = 4290
Step 31: 4290 + 143 = 4433
Step 32: 4433 + 143 = 4576
Step 33: 4576 + 143 = 4719
Step 34: 4719 + 143 = 4862
Step 35: 4862 + 143 = 5005
Step 36: 5005 + 143 = 5148
Step 37: 5148 + 143 = 5291
Step 38: 5291 + 143 = 5434
Step 39: 5434 + 143 = 5577
Step 40: 5577 + 143 = 5720
Step 41: 5720 + 143 = 5863
Step 42: 5863 + 143 = 6006
Step 43: 6006 + 143 = 6149
Step 44: 6149 + 143 = 6292
Step 45: 6292 + 143 = 6435
Step 46: 6435 + 143 = 6578
Step 47: 6578 + 143 = 6721
Step 48: 6721 + 143 = 6864
Step 49: 6864 + 143 = 7007
Step 50: 7007 + 143 = 7150
Step 51: 7150 + 143 = 7293
Step 52: 7293 + 143 = 7436
Step 53: 7436 + 143 = 7579
Step 54: 7579 + 143 = 7722
Step 55: 7722 + 143 = 7865
Step 56: 7865 + 143 = 8008
Step 57: 8008 + 143 = 8151
Step 58: 8151 + 143 = 8294
Step 59: 8294 + 143 = 8437
Step 60: 8437 + 143 = 8580
Step 61: 8580 + 143 = 8723
Step 62: 8723 + 143 = 8866
Step 63: 8866 + 143 = 9009
Step 64: 9009 + 143 = 9152
Step 65: 9152 + 143 = 9295
Step 66: 9295 + 143 = 9438
Step 67: 9438 + 143 = 9581
Step 68: 9581 + 143 = 9724
Step 69: 9724 + 143 = 9867
Step 70: 9867 + 143 = 10010
Step 71: 10010 + 143 = 10153
Step 72: 10153 + 143 = 10296
Step 73: 10296 + 143 = 10439
Step 74: 10439 + 143 = 10582
Step 75: 10582 + 143 = 10725
Step 76: 10725 + 143 = 10868
Step 77: 10868 + 143 = 11011
Step 78: 11011 + 143 = 11154
Step 79: 11154 + 143 = 11297
Step 80: 11297 + 143 = 11440
Step 81: 11440 + 143 = 11583
Step 82: 11583 + 143 = 11726
Step 83: 11726 + 143 = 11869
Step 84: 11869 + 143 = 12012
Step 85: 12012 + 143 = 12155
Step 86: 12155 + 143 = 12298
Step 87: 12298 + 143 = 12441
Step 88: 12441 + 143 = 12584
Step 89: 12584 + 143 = 12727
Step 90: 12727 + 143 = 12870
Step 91: 12870 + 143 = 13013
Step 92: 13013 + 143 = 13156
Step 93: 13156 + 143 = 13299
Step 94: 13299 + 143 = 13442
Step 95: 13442 + 143 = 13585
Step 96: 13585 + 143 = 13728
Step 97: 13728 + 143 = 13871
Step 98: 13871 + 143 = 14014
Step 99: 14014 + 143 = 14157
Step 100: 14157 + 143 = 14300
Step 101: 14300 + 143 = 14443
Step 102: 14443 + 143 = 14586
Step 103: 14586 + 143 = 14729
Step 104: 14729 + 143 = 14872
Step 105: 14872 + 143 = 15015
Step 106: 15015 + 143 = 15158
Step 107: 15158 + 143 = 15301
Step 108: 15301 + 143 = 15444
Step 109: 15444 + 143 = 15587
Step 110: 15587 + 143 = 15730
Step 111: 15730 + 143 = 15873
Step 112: 15873 + 143 = 16016
Step 113: 16016 + 143 = 16159
Step 114: 16159 + 143 = 16302
Step 115: 16302 + 143 = 16445
Step 116: 16445 + 143 = 16588
Step 117: 16588 + 143 = 16731
Step 118: 16731 + 143 = 16874
Step 119: 16874 + 143 = 17017
Step 120: 17017 + 143 = 17160
Step 121: 17160 + 143 = 17303
Step 122: 17303 + 143 = 17446
Step 123: 17446 + 143 = 17589
Step 124: 17589 + 143 = 17732
Step 125: 17732 + 143 = 17875
Step 126: 17875 + 143 = 18018
Step 127: 18018 + 143 = 18161
Step 128: 18161 + 143 = 18304
Step 129: 18304 + 143 = 18447
Step 130: 18447 + 143 = 18590
Step 131: 18590 + 143 = 18733
Step 132: 18733 + 143 = 18876
Step 133: 18876 + 143 = 19019
Step 134: 19019 + 143 = 19162
Step 135: 19162 + 143 = 19305
Step 136: 19305 + 143 = 19448
Step 137: 19448 + 143 = 19591
Step 138: 19591 + 143 = 19734
Step 139: 19734 + 143 = 19877
Step 140: 19877 + 143 = 20020
Step 141: 20020 + 143 = 20163
Step 142: 20163 + 143 = 20306
Step 143: 20306 + 143 = 20449
Step 144: 20449 + 143 = 20592
Step 145: 20592 + 143 = 20735
Step 146: 20735 + 143 = 20878
Step 147: 20878 + 143 = 21021
Step 148: 21021 + 143 = 21164
Step 149: 21164 + 143 = 21307
Step 150: 21307 + 143 = 21450
Step 151: 21450 + 143 = 21593
Step 152: 21593 + 143 = 21736
Step 153: 21736 + 143 = 21879
Step 154: 21879 + 143 = 22022
Step 155: 22022 + 143 = 22165
Step 156: 22165 + 143 = 22308
Step 157: 22308 + 143 = 22451
Step 158: 22451 + 143 = 22594
Step 159: 22594 + 143 = 22737
Step 160: 22737 + 143 = 22880
Step 161: 22880 + 143 = 23023
Step 162: 23023 + 143 = 23166
Step 163: 23166 + 143 = 23309
Step 164: 23309 + 143 = 23452
Step 165: 23452 + 143 = 23595
Step 166: 23595 + 143 = 23738
Step 167: 23738 + 143 = 23881
Step 168: 23881 + 143 = 24024
Step 169: 24024 + 143 = 24167
Step 170: 24167 + 143 = 24310
Step 171: 24310 + 143 = 24453
Step 172: 24453 + 143 = 24596
Step 173: 24596 + 143 = 24739
Step 174: 24739 + 143 = 24882
Step 175: 24882 + 143 = 25025
Step 176: 25025 + 143 = 25168
Step 177: 25168 + 143 = 25311
Step 178: 25311 + 143 = 25454
Step 179: 25454 + 143 = 25597
Step 180: 25597 + 143 = 25740
Step 181: 25740 + 143 = 25883
Step 182: 25883 + 143 = 26026
Step 183: 26026 + 143 = 26169
Step 184: 26169 + 143 = 26312
Step 185: 26312 + 143 = 26455
Step 186: 26455 + 143 = 26598
Step 187: 26598 + 143 = 26741
Step 188: 26741 + 143 = 26884
Step 189: 26884 + 143 = 27027
Step 190: 27027 + 143 = 27170
Step 191: 27170 + 143 = 27313
Step 192: 27313 + 143 = 27456
Step 193: 27456 + 143 = 27599
Step 194: 27599 + 143 = 27742
Step 195: 27742 + 143 = 27885
Step 196: 27885 + 143 = 28028
Step 197: 28028 + 143 = 28171
Step 198: 28171 + 143 = 28314
Step 199: 28314 + 143 = 28457
Step 200: 28457 + 143 = 28600
Step 201: 28600 + 143 = 28743
Step 202: 28743 + 143 = 28886
Step 203: 28886 + 143 = 29029
Step 204: 29029 + 143 = 29172
Step 205: 29172 + 143 = 29315
Step 206: 29315 + 143 = 29458
Step 207: 29458 + 143 = 29601
Step 208: 29601 + 143 = 29744
Step 209: 29744 + 143 = 29887
Step 210: 29887 + 143 = 30030
Step 211: 30030 + 143 = 30173
Step 212: 30173 + 143 = 30316
Step 213: 30316 + 143 = 30459
Step 214: 30459 + 143 = 30602
Step 215: 30602 + 143 = 30745
Step 216: 30745 + 143 = 30888
Step 217: 30888 + 143 = 31031
Step 218: 31031 + 143 = 31174
Step 219: 31174 + 143 = 31317
Step 220: 31317 + 143 = 31460
Step 221: 31460 + 143 = 31603
Step 222: 31603 + 143 = 31746
Step 223: 31746 + 143 = 31889
Step 224: 31889 + 143 = 32032
Step 225: 32032 + 143 = 32175
Step 226: 32175 + 143 = 32318
Step 227: 32318 + 143 = 32461
Step 228: 32461 + 143 = 32604
Step 229: 32604 + 143 = 32747
Step 230: 32747 + 143 = 32890
Step 231: 32890 + 143 = 33033
Step 232: 33033 + 143 = 33176
Step 233: 33176 + 143 = 33319
Step 234: 33319 + 143 = 33462
Step 235: 33462 + 143 = 33605
Step 236: 33605 + 143 = 33748
Step 237: 33748 + 143 = 33891
Step 238: 33891 + 143 = 34034
Step 239: 34034 + 143 = 34177
Step 240: 34177 + 143 = 34320
Step 241: 34320 + 143 = 34463
Step 242: 34463 + 143 = 34606
Step 243: 34606 + 143 = 34749
Step 244: 34749 + 143 = 34892
Step 245: 34892 + 143 = 35035
Step 246: 35035 + 143 = 35178
Step 247: 35178 + 143 = 35321
Step 248: 35321 + 143 = 35464
Step 249: 35464 + 143 = 35607
Step 250: 35607 + 143 = 35750
Step 251: 35750 + 143 = 35893
Step 252: 35893 + 143 = 36036
Step 253: 36036 + 143 = 36179
Step 254: 36179 + 143 = 36322
Step 255: 36322 + 143 = 36465
Step 256: 36465 + 143 = 36608
Step 257: 36608 + 143 = 36751
Step 258: 36751 + 143 = 36894
Step 259: 36894 + 143 = 37037
Step 260: 37037 + 143 = 37180
Step 261: 37180 + 143 = 37323
Step 262: 37323 + 143 = 37466
Step 263: 37466 + 143 = 37609
Step 264: 37609 + 143 = 37752
Step 265: 37752 + 143 = 37895
Step 266: 37895 + 143 = 38038
Step 267: 38038 + 143 = 38181
Step 268: 38181 + 143 = 38324
Step 269: 38324 + 143 = 38467
Step 270: 38467 + 143 = 38610
Step 271: 38610 + 143 = 38753
Step 272: 38753 + 143 = 38896
Step 273: 38896 + 143 = 39039
Step 274: 39039 + 143 = 39182
Step 275: 39182 + 143 = 39325
Step 276: 39325 + 143 = 39468
Step 277: 39468 + 143 = 39611
Step 278: 39611 + 143 = 39754
Step 279: 39754 + 143 = 39897
Step 280: 39897 + 143 = 40040
Step 281: 40040 + 143 = 40183
Step 282: 40183 + 143 = 40326
Step 283: 40326 + 143 = 40469
Step 284: 40469 + 143 = 40612
Step 285: 40612 + 143 = 40755
Step 286: 40755 + 143 = 40898
Step 287: 40898 + 143 = 41041
Step 288: 41041 + 143 = 41184
Step 289: 41184 + 143 = 41327
Step 290: 41327 + 143 = 41470
Step 291: 41470 + 143 = 41613
Step 292: 41613 + 143 = 41756
Step 293: 41756 + 143 = 41899
Step 294: 41899 + 143 = 42042
Step 295: 42042 + 143 = 42185
Step 296: 42185 + 143 = 42328
Step 297: 42328 + 143 = 42471
Step 298: 42471 + 143 = 42614
Step 299: 42614 + 143 = 42757
Step 300: 42757 + 143 = 42900
Step 301: 42900 + 143 = 43043
Step 302: 43043 + 143 = 43186
Step 303: 43186 + 143 = 43329
Step 304: 43329 + 143 = 43472
Step 305: 43472 + 143 = 43615
Step 306: 43615 + 143 = 43758
Step 307: 43758 + 143 = 43901
Step 308: 43901 + 143 = 44044
Step 309: 44044 + 143 = 44187
Step 310: 44187 + 143 = 44330
Step 311: 44330 + 143 = 44473
Step 312: 44473 + 143 = 44616
Step 313: 44616 + 143 = 44759
Step 314: 44759 + 143 = 44902
Step 315: 44902 + 143 = 45045
Step 316: 45045 + 143 = 45188
Step 317: 45188 + 143 = 45331
Step 318: 45331 + 143 = 45474
Step 319: 45474 + 143 = 45617
Step 320: 45617 + 143 = 45760
Step 321: 45760 + 143 = 45903
Step 322: 45903 + 143 = 46046
Step 323: 46046 + 143 = 46189
Step 324: 46189 + 143 = 46332
Step 325: 46332 + 143 = 46475
Step 326: 46475 + 143 = 46618
Step 327: 46618 + 143 = 46761
Step 328: 46761 + 143 = 46904
Step 329: 46904 + 143 = 47047
Step 330: 47047 + 143 = 47190
Step 331: 47190 + 143 = 47333
Step 332: 47333 + 143 = 47476
Step 333: 47476 + 143 = 47619
Step 334: 47619 + 143 = 47762
Step 335: 47762 + 143 = 47905
Step 336: 47905 + 143 = 48048
Step 337: 48048 + 143 = 48191
Step 338: 48191 + 143 = 48334
Step 339: 48334 + 143 = 48477
Step 340: 48477 + 143 = 48620
Step 341: 48620 + 143 = 48763
Step 342: 48763 + 143 = 48906
Step 343: 48906 + 143 = 49049
Step 344: 49049 + 143 = 49192
Step 345: 49192 + 143 = 49335

So, 143*345 = 49335