Let's roll up our sleeves and solve this. We have 901 and we're going to multiply it by 146, essentially adding 901 to itself 146 times.
Step 1: 0 + 901 = 901
Step 2: 901 + 901 = 1802
Step 3: 1802 + 901 = 2703
Step 4: 2703 + 901 = 3604
Step 5: 3604 + 901 = 4505
Step 6: 4505 + 901 = 5406
Step 7: 5406 + 901 = 6307
Step 8: 6307 + 901 = 7208
Step 9: 7208 + 901 = 8109
Step 10: 8109 + 901 = 9010
Step 11: 9010 + 901 = 9911
Step 12: 9911 + 901 = 10812
Step 13: 10812 + 901 = 11713
Step 14: 11713 + 901 = 12614
Step 15: 12614 + 901 = 13515
Step 16: 13515 + 901 = 14416
Step 17: 14416 + 901 = 15317
Step 18: 15317 + 901 = 16218
Step 19: 16218 + 901 = 17119
Step 20: 17119 + 901 = 18020
Step 21: 18020 + 901 = 18921
Step 22: 18921 + 901 = 19822
Step 23: 19822 + 901 = 20723
Step 24: 20723 + 901 = 21624
Step 25: 21624 + 901 = 22525
Step 26: 22525 + 901 = 23426
Step 27: 23426 + 901 = 24327
Step 28: 24327 + 901 = 25228
Step 29: 25228 + 901 = 26129
Step 30: 26129 + 901 = 27030
Step 31: 27030 + 901 = 27931
Step 32: 27931 + 901 = 28832
Step 33: 28832 + 901 = 29733
Step 34: 29733 + 901 = 30634
Step 35: 30634 + 901 = 31535
Step 36: 31535 + 901 = 32436
Step 37: 32436 + 901 = 33337
Step 38: 33337 + 901 = 34238
Step 39: 34238 + 901 = 35139
Step 40: 35139 + 901 = 36040
Step 41: 36040 + 901 = 36941
Step 42: 36941 + 901 = 37842
Step 43: 37842 + 901 = 38743
Step 44: 38743 + 901 = 39644
Step 45: 39644 + 901 = 40545
Step 46: 40545 + 901 = 41446
Step 47: 41446 + 901 = 42347
Step 48: 42347 + 901 = 43248
Step 49: 43248 + 901 = 44149
Step 50: 44149 + 901 = 45050
Step 51: 45050 + 901 = 45951
Step 52: 45951 + 901 = 46852
Step 53: 46852 + 901 = 47753
Step 54: 47753 + 901 = 48654
Step 55: 48654 + 901 = 49555
Step 56: 49555 + 901 = 50456
Step 57: 50456 + 901 = 51357
Step 58: 51357 + 901 = 52258
Step 59: 52258 + 901 = 53159
Step 60: 53159 + 901 = 54060
Step 61: 54060 + 901 = 54961
Step 62: 54961 + 901 = 55862
Step 63: 55862 + 901 = 56763
Step 64: 56763 + 901 = 57664
Step 65: 57664 + 901 = 58565
Step 66: 58565 + 901 = 59466
Step 67: 59466 + 901 = 60367
Step 68: 60367 + 901 = 61268
Step 69: 61268 + 901 = 62169
Step 70: 62169 + 901 = 63070
Step 71: 63070 + 901 = 63971
Step 72: 63971 + 901 = 64872
Step 73: 64872 + 901 = 65773
Step 74: 65773 + 901 = 66674
Step 75: 66674 + 901 = 67575
Step 76: 67575 + 901 = 68476
Step 77: 68476 + 901 = 69377
Step 78: 69377 + 901 = 70278
Step 79: 70278 + 901 = 71179
Step 80: 71179 + 901 = 72080
Step 81: 72080 + 901 = 72981
Step 82: 72981 + 901 = 73882
Step 83: 73882 + 901 = 74783
Step 84: 74783 + 901 = 75684
Step 85: 75684 + 901 = 76585
Step 86: 76585 + 901 = 77486
Step 87: 77486 + 901 = 78387
Step 88: 78387 + 901 = 79288
Step 89: 79288 + 901 = 80189
Step 90: 80189 + 901 = 81090
Step 91: 81090 + 901 = 81991
Step 92: 81991 + 901 = 82892
Step 93: 82892 + 901 = 83793
Step 94: 83793 + 901 = 84694
Step 95: 84694 + 901 = 85595
Step 96: 85595 + 901 = 86496
Step 97: 86496 + 901 = 87397
Step 98: 87397 + 901 = 88298
Step 99: 88298 + 901 = 89199
Step 100: 89199 + 901 = 90100
Step 101: 90100 + 901 = 91001
Step 102: 91001 + 901 = 91902
Step 103: 91902 + 901 = 92803
Step 104: 92803 + 901 = 93704
Step 105: 93704 + 901 = 94605
Step 106: 94605 + 901 = 95506
Step 107: 95506 + 901 = 96407
Step 108: 96407 + 901 = 97308
Step 109: 97308 + 901 = 98209
Step 110: 98209 + 901 = 99110
Step 111: 99110 + 901 = 100011
Step 112: 100011 + 901 = 100912
Step 113: 100912 + 901 = 101813
Step 114: 101813 + 901 = 102714
Step 115: 102714 + 901 = 103615
Step 116: 103615 + 901 = 104516
Step 117: 104516 + 901 = 105417
Step 118: 105417 + 901 = 106318
Step 119: 106318 + 901 = 107219
Step 120: 107219 + 901 = 108120
Step 121: 108120 + 901 = 109021
Step 122: 109021 + 901 = 109922
Step 123: 109922 + 901 = 110823
Step 124: 110823 + 901 = 111724
Step 125: 111724 + 901 = 112625
Step 126: 112625 + 901 = 113526
Step 127: 113526 + 901 = 114427
Step 128: 114427 + 901 = 115328
Step 129: 115328 + 901 = 116229
Step 130: 116229 + 901 = 117130
Step 131: 117130 + 901 = 118031
Step 132: 118031 + 901 = 118932
Step 133: 118932 + 901 = 119833
Step 134: 119833 + 901 = 120734
Step 135: 120734 + 901 = 121635
Step 136: 121635 + 901 = 122536
Step 137: 122536 + 901 = 123437
Step 138: 123437 + 901 = 124338
Step 139: 124338 + 901 = 125239
Step 140: 125239 + 901 = 126140
Step 141: 126140 + 901 = 127041
Step 142: 127041 + 901 = 127942
Step 143: 127942 + 901 = 128843
Step 144: 128843 + 901 = 129744
Step 145: 129744 + 901 = 130645
Step 146: 130645 + 901 = 131546

So, 901*146 = 131546