Sure thing! We've got 481 and we're gonna multiply it by 90. That's the same as adding 481 to itself 90 times.
Step 1: 0 + 481 = 481
Step 2: 481 + 481 = 962
Step 3: 962 + 481 = 1443
Step 4: 1443 + 481 = 1924
Step 5: 1924 + 481 = 2405
Step 6: 2405 + 481 = 2886
Step 7: 2886 + 481 = 3367
Step 8: 3367 + 481 = 3848
Step 9: 3848 + 481 = 4329
Step 10: 4329 + 481 = 4810
Step 11: 4810 + 481 = 5291
Step 12: 5291 + 481 = 5772
Step 13: 5772 + 481 = 6253
Step 14: 6253 + 481 = 6734
Step 15: 6734 + 481 = 7215
Step 16: 7215 + 481 = 7696
Step 17: 7696 + 481 = 8177
Step 18: 8177 + 481 = 8658
Step 19: 8658 + 481 = 9139
Step 20: 9139 + 481 = 9620
Step 21: 9620 + 481 = 10101
Step 22: 10101 + 481 = 10582
Step 23: 10582 + 481 = 11063
Step 24: 11063 + 481 = 11544
Step 25: 11544 + 481 = 12025
Step 26: 12025 + 481 = 12506
Step 27: 12506 + 481 = 12987
Step 28: 12987 + 481 = 13468
Step 29: 13468 + 481 = 13949
Step 30: 13949 + 481 = 14430
Step 31: 14430 + 481 = 14911
Step 32: 14911 + 481 = 15392
Step 33: 15392 + 481 = 15873
Step 34: 15873 + 481 = 16354
Step 35: 16354 + 481 = 16835
Step 36: 16835 + 481 = 17316
Step 37: 17316 + 481 = 17797
Step 38: 17797 + 481 = 18278
Step 39: 18278 + 481 = 18759
Step 40: 18759 + 481 = 19240
Step 41: 19240 + 481 = 19721
Step 42: 19721 + 481 = 20202
Step 43: 20202 + 481 = 20683
Step 44: 20683 + 481 = 21164
Step 45: 21164 + 481 = 21645
Step 46: 21645 + 481 = 22126
Step 47: 22126 + 481 = 22607
Step 48: 22607 + 481 = 23088
Step 49: 23088 + 481 = 23569
Step 50: 23569 + 481 = 24050
Step 51: 24050 + 481 = 24531
Step 52: 24531 + 481 = 25012
Step 53: 25012 + 481 = 25493
Step 54: 25493 + 481 = 25974
Step 55: 25974 + 481 = 26455
Step 56: 26455 + 481 = 26936
Step 57: 26936 + 481 = 27417
Step 58: 27417 + 481 = 27898
Step 59: 27898 + 481 = 28379
Step 60: 28379 + 481 = 28860
Step 61: 28860 + 481 = 29341
Step 62: 29341 + 481 = 29822
Step 63: 29822 + 481 = 30303
Step 64: 30303 + 481 = 30784
Step 65: 30784 + 481 = 31265
Step 66: 31265 + 481 = 31746
Step 67: 31746 + 481 = 32227
Step 68: 32227 + 481 = 32708
Step 69: 32708 + 481 = 33189
Step 70: 33189 + 481 = 33670
Step 71: 33670 + 481 = 34151
Step 72: 34151 + 481 = 34632
Step 73: 34632 + 481 = 35113
Step 74: 35113 + 481 = 35594
Step 75: 35594 + 481 = 36075
Step 76: 36075 + 481 = 36556
Step 77: 36556 + 481 = 37037
Step 78: 37037 + 481 = 37518
Step 79: 37518 + 481 = 37999
Step 80: 37999 + 481 = 38480
Step 81: 38480 + 481 = 38961
Step 82: 38961 + 481 = 39442
Step 83: 39442 + 481 = 39923
Step 84: 39923 + 481 = 40404
Step 85: 40404 + 481 = 40885
Step 86: 40885 + 481 = 41366
Step 87: 41366 + 481 = 41847
Step 88: 41847 + 481 = 42328
Step 89: 42328 + 481 = 42809
Step 90: 42809 + 481 = 43290

So, 481*90 = 43290