OK, let's crack this. We're given 4 and our task is to multiply it by 149. Essentially, we'll be adding 4 to itself 149 times.
Step 1: 0 + 4 = 4
Step 2: 4 + 4 = 8
Step 3: 8 + 4 = 12
Step 4: 12 + 4 = 16
Step 5: 16 + 4 = 20
Step 6: 20 + 4 = 24
Step 7: 24 + 4 = 28
Step 8: 28 + 4 = 32
Step 9: 32 + 4 = 36
Step 10: 36 + 4 = 40
Step 11: 40 + 4 = 44
Step 12: 44 + 4 = 48
Step 13: 48 + 4 = 52
Step 14: 52 + 4 = 56
Step 15: 56 + 4 = 60
Step 16: 60 + 4 = 64
Step 17: 64 + 4 = 68
Step 18: 68 + 4 = 72
Step 19: 72 + 4 = 76
Step 20: 76 + 4 = 80
Step 21: 80 + 4 = 84
Step 22: 84 + 4 = 88
Step 23: 88 + 4 = 92
Step 24: 92 + 4 = 96
Step 25: 96 + 4 = 100
Step 26: 100 + 4 = 104
Step 27: 104 + 4 = 108
Step 28: 108 + 4 = 112
Step 29: 112 + 4 = 116
Step 30: 116 + 4 = 120
Step 31: 120 + 4 = 124
Step 32: 124 + 4 = 128
Step 33: 128 + 4 = 132
Step 34: 132 + 4 = 136
Step 35: 136 + 4 = 140
Step 36: 140 + 4 = 144
Step 37: 144 + 4 = 148
Step 38: 148 + 4 = 152
Step 39: 152 + 4 = 156
Step 40: 156 + 4 = 160
Step 41: 160 + 4 = 164
Step 42: 164 + 4 = 168
Step 43: 168 + 4 = 172
Step 44: 172 + 4 = 176
Step 45: 176 + 4 = 180
Step 46: 180 + 4 = 184
Step 47: 184 + 4 = 188
Step 48: 188 + 4 = 192
Step 49: 192 + 4 = 196
Step 50: 196 + 4 = 200
Step 51: 200 + 4 = 204
Step 52: 204 + 4 = 208
Step 53: 208 + 4 = 212
Step 54: 212 + 4 = 216
Step 55: 216 + 4 = 220
Step 56: 220 + 4 = 224
Step 57: 224 + 4 = 228
Step 58: 228 + 4 = 232
Step 59: 232 + 4 = 236
Step 60: 236 + 4 = 240
Step 61: 240 + 4 = 244
Step 62: 244 + 4 = 248
Step 63: 248 + 4 = 252
Step 64: 252 + 4 = 256
Step 65: 256 + 4 = 260
Step 66: 260 + 4 = 264
Step 67: 264 + 4 = 268
Step 68: 268 + 4 = 272
Step 69: 272 + 4 = 276
Step 70: 276 + 4 = 280
Step 71: 280 + 4 = 284
Step 72: 284 + 4 = 288
Step 73: 288 + 4 = 292
Step 74: 292 + 4 = 296
Step 75: 296 + 4 = 300
Step 76: 300 + 4 = 304
Step 77: 304 + 4 = 308
Step 78: 308 + 4 = 312
Step 79: 312 + 4 = 316
Step 80: 316 + 4 = 320
Step 81: 320 + 4 = 324
Step 82: 324 + 4 = 328
Step 83: 328 + 4 = 332
Step 84: 332 + 4 = 336
Step 85: 336 + 4 = 340
Step 86: 340 + 4 = 344
Step 87: 344 + 4 = 348
Step 88: 348 + 4 = 352
Step 89: 352 + 4 = 356
Step 90: 356 + 4 = 360
Step 91: 360 + 4 = 364
Step 92: 364 + 4 = 368
Step 93: 368 + 4 = 372
Step 94: 372 + 4 = 376
Step 95: 376 + 4 = 380
Step 96: 380 + 4 = 384
Step 97: 384 + 4 = 388
Step 98: 388 + 4 = 392
Step 99: 392 + 4 = 396
Step 100: 396 + 4 = 400
Step 101: 400 + 4 = 404
Step 102: 404 + 4 = 408
Step 103: 408 + 4 = 412
Step 104: 412 + 4 = 416
Step 105: 416 + 4 = 420
Step 106: 420 + 4 = 424
Step 107: 424 + 4 = 428
Step 108: 428 + 4 = 432
Step 109: 432 + 4 = 436
Step 110: 436 + 4 = 440
Step 111: 440 + 4 = 444
Step 112: 444 + 4 = 448
Step 113: 448 + 4 = 452
Step 114: 452 + 4 = 456
Step 115: 456 + 4 = 460
Step 116: 460 + 4 = 464
Step 117: 464 + 4 = 468
Step 118: 468 + 4 = 472
Step 119: 472 + 4 = 476
Step 120: 476 + 4 = 480
Step 121: 480 + 4 = 484
Step 122: 484 + 4 = 488
Step 123: 488 + 4 = 492
Step 124: 492 + 4 = 496
Step 125: 496 + 4 = 500
Step 126: 500 + 4 = 504
Step 127: 504 + 4 = 508
Step 128: 508 + 4 = 512
Step 129: 512 + 4 = 516
Step 130: 516 + 4 = 520
Step 131: 520 + 4 = 524
Step 132: 524 + 4 = 528
Step 133: 528 + 4 = 532
Step 134: 532 + 4 = 536
Step 135: 536 + 4 = 540
Step 136: 540 + 4 = 544
Step 137: 544 + 4 = 548
Step 138: 548 + 4 = 552
Step 139: 552 + 4 = 556
Step 140: 556 + 4 = 560
Step 141: 560 + 4 = 564
Step 142: 564 + 4 = 568
Step 143: 568 + 4 = 572
Step 144: 572 + 4 = 576
Step 145: 576 + 4 = 580
Step 146: 580 + 4 = 584
Step 147: 584 + 4 = 588
Step 148: 588 + 4 = 592
Step 149: 592 + 4 = 596

So, 4*149 = 596