Alright, let's solve this math problem step by step. First, we have the number 4. Next, we see the multiplication sign, which means we need to multiply something. And what are we multiplying it by? We multiply it by 157. So, we're going to take the number 4 and add it to itself 157 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
Step 150: 596 + 4 = 600
Step 151: 600 + 4 = 604
Step 152: 604 + 4 = 608
Step 153: 608 + 4 = 612
Step 154: 612 + 4 = 616
Step 155: 616 + 4 = 620
Step 156: 620 + 4 = 624
Step 157: 624 + 4 = 628

So, 4*157 = 628