Let's get this math done. We have 315 and we're going to multiply it by 134. This is the same as taking 315 and adding it to itself 134 times.
Step 1: 0 + 315 = 315
Step 2: 315 + 315 = 630
Step 3: 630 + 315 = 945
Step 4: 945 + 315 = 1260
Step 5: 1260 + 315 = 1575
Step 6: 1575 + 315 = 1890
Step 7: 1890 + 315 = 2205
Step 8: 2205 + 315 = 2520
Step 9: 2520 + 315 = 2835
Step 10: 2835 + 315 = 3150
Step 11: 3150 + 315 = 3465
Step 12: 3465 + 315 = 3780
Step 13: 3780 + 315 = 4095
Step 14: 4095 + 315 = 4410
Step 15: 4410 + 315 = 4725
Step 16: 4725 + 315 = 5040
Step 17: 5040 + 315 = 5355
Step 18: 5355 + 315 = 5670
Step 19: 5670 + 315 = 5985
Step 20: 5985 + 315 = 6300
Step 21: 6300 + 315 = 6615
Step 22: 6615 + 315 = 6930
Step 23: 6930 + 315 = 7245
Step 24: 7245 + 315 = 7560
Step 25: 7560 + 315 = 7875
Step 26: 7875 + 315 = 8190
Step 27: 8190 + 315 = 8505
Step 28: 8505 + 315 = 8820
Step 29: 8820 + 315 = 9135
Step 30: 9135 + 315 = 9450
Step 31: 9450 + 315 = 9765
Step 32: 9765 + 315 = 10080
Step 33: 10080 + 315 = 10395
Step 34: 10395 + 315 = 10710
Step 35: 10710 + 315 = 11025
Step 36: 11025 + 315 = 11340
Step 37: 11340 + 315 = 11655
Step 38: 11655 + 315 = 11970
Step 39: 11970 + 315 = 12285
Step 40: 12285 + 315 = 12600
Step 41: 12600 + 315 = 12915
Step 42: 12915 + 315 = 13230
Step 43: 13230 + 315 = 13545
Step 44: 13545 + 315 = 13860
Step 45: 13860 + 315 = 14175
Step 46: 14175 + 315 = 14490
Step 47: 14490 + 315 = 14805
Step 48: 14805 + 315 = 15120
Step 49: 15120 + 315 = 15435
Step 50: 15435 + 315 = 15750
Step 51: 15750 + 315 = 16065
Step 52: 16065 + 315 = 16380
Step 53: 16380 + 315 = 16695
Step 54: 16695 + 315 = 17010
Step 55: 17010 + 315 = 17325
Step 56: 17325 + 315 = 17640
Step 57: 17640 + 315 = 17955
Step 58: 17955 + 315 = 18270
Step 59: 18270 + 315 = 18585
Step 60: 18585 + 315 = 18900
Step 61: 18900 + 315 = 19215
Step 62: 19215 + 315 = 19530
Step 63: 19530 + 315 = 19845
Step 64: 19845 + 315 = 20160
Step 65: 20160 + 315 = 20475
Step 66: 20475 + 315 = 20790
Step 67: 20790 + 315 = 21105
Step 68: 21105 + 315 = 21420
Step 69: 21420 + 315 = 21735
Step 70: 21735 + 315 = 22050
Step 71: 22050 + 315 = 22365
Step 72: 22365 + 315 = 22680
Step 73: 22680 + 315 = 22995
Step 74: 22995 + 315 = 23310
Step 75: 23310 + 315 = 23625
Step 76: 23625 + 315 = 23940
Step 77: 23940 + 315 = 24255
Step 78: 24255 + 315 = 24570
Step 79: 24570 + 315 = 24885
Step 80: 24885 + 315 = 25200
Step 81: 25200 + 315 = 25515
Step 82: 25515 + 315 = 25830
Step 83: 25830 + 315 = 26145
Step 84: 26145 + 315 = 26460
Step 85: 26460 + 315 = 26775
Step 86: 26775 + 315 = 27090
Step 87: 27090 + 315 = 27405
Step 88: 27405 + 315 = 27720
Step 89: 27720 + 315 = 28035
Step 90: 28035 + 315 = 28350
Step 91: 28350 + 315 = 28665
Step 92: 28665 + 315 = 28980
Step 93: 28980 + 315 = 29295
Step 94: 29295 + 315 = 29610
Step 95: 29610 + 315 = 29925
Step 96: 29925 + 315 = 30240
Step 97: 30240 + 315 = 30555
Step 98: 30555 + 315 = 30870
Step 99: 30870 + 315 = 31185
Step 100: 31185 + 315 = 31500
Step 101: 31500 + 315 = 31815
Step 102: 31815 + 315 = 32130
Step 103: 32130 + 315 = 32445
Step 104: 32445 + 315 = 32760
Step 105: 32760 + 315 = 33075
Step 106: 33075 + 315 = 33390
Step 107: 33390 + 315 = 33705
Step 108: 33705 + 315 = 34020
Step 109: 34020 + 315 = 34335
Step 110: 34335 + 315 = 34650
Step 111: 34650 + 315 = 34965
Step 112: 34965 + 315 = 35280
Step 113: 35280 + 315 = 35595
Step 114: 35595 + 315 = 35910
Step 115: 35910 + 315 = 36225
Step 116: 36225 + 315 = 36540
Step 117: 36540 + 315 = 36855
Step 118: 36855 + 315 = 37170
Step 119: 37170 + 315 = 37485
Step 120: 37485 + 315 = 37800
Step 121: 37800 + 315 = 38115
Step 122: 38115 + 315 = 38430
Step 123: 38430 + 315 = 38745
Step 124: 38745 + 315 = 39060
Step 125: 39060 + 315 = 39375
Step 126: 39375 + 315 = 39690
Step 127: 39690 + 315 = 40005
Step 128: 40005 + 315 = 40320
Step 129: 40320 + 315 = 40635
Step 130: 40635 + 315 = 40950
Step 131: 40950 + 315 = 41265
Step 132: 41265 + 315 = 41580
Step 133: 41580 + 315 = 41895
Step 134: 41895 + 315 = 42210

So, 315*134 = 42210