Sure thing, let's get straight to it. We start with 163 and we're going to multiply it by 90, which means adding 163 to itself 90 times.
Step 1: 0 + 163 = 163
Step 2: 163 + 163 = 326
Step 3: 326 + 163 = 489
Step 4: 489 + 163 = 652
Step 5: 652 + 163 = 815
Step 6: 815 + 163 = 978
Step 7: 978 + 163 = 1141
Step 8: 1141 + 163 = 1304
Step 9: 1304 + 163 = 1467
Step 10: 1467 + 163 = 1630
Step 11: 1630 + 163 = 1793
Step 12: 1793 + 163 = 1956
Step 13: 1956 + 163 = 2119
Step 14: 2119 + 163 = 2282
Step 15: 2282 + 163 = 2445
Step 16: 2445 + 163 = 2608
Step 17: 2608 + 163 = 2771
Step 18: 2771 + 163 = 2934
Step 19: 2934 + 163 = 3097
Step 20: 3097 + 163 = 3260
Step 21: 3260 + 163 = 3423
Step 22: 3423 + 163 = 3586
Step 23: 3586 + 163 = 3749
Step 24: 3749 + 163 = 3912
Step 25: 3912 + 163 = 4075
Step 26: 4075 + 163 = 4238
Step 27: 4238 + 163 = 4401
Step 28: 4401 + 163 = 4564
Step 29: 4564 + 163 = 4727
Step 30: 4727 + 163 = 4890
Step 31: 4890 + 163 = 5053
Step 32: 5053 + 163 = 5216
Step 33: 5216 + 163 = 5379
Step 34: 5379 + 163 = 5542
Step 35: 5542 + 163 = 5705
Step 36: 5705 + 163 = 5868
Step 37: 5868 + 163 = 6031
Step 38: 6031 + 163 = 6194
Step 39: 6194 + 163 = 6357
Step 40: 6357 + 163 = 6520
Step 41: 6520 + 163 = 6683
Step 42: 6683 + 163 = 6846
Step 43: 6846 + 163 = 7009
Step 44: 7009 + 163 = 7172
Step 45: 7172 + 163 = 7335
Step 46: 7335 + 163 = 7498
Step 47: 7498 + 163 = 7661
Step 48: 7661 + 163 = 7824
Step 49: 7824 + 163 = 7987
Step 50: 7987 + 163 = 8150
Step 51: 8150 + 163 = 8313
Step 52: 8313 + 163 = 8476
Step 53: 8476 + 163 = 8639
Step 54: 8639 + 163 = 8802
Step 55: 8802 + 163 = 8965
Step 56: 8965 + 163 = 9128
Step 57: 9128 + 163 = 9291
Step 58: 9291 + 163 = 9454
Step 59: 9454 + 163 = 9617
Step 60: 9617 + 163 = 9780
Step 61: 9780 + 163 = 9943
Step 62: 9943 + 163 = 10106
Step 63: 10106 + 163 = 10269
Step 64: 10269 + 163 = 10432
Step 65: 10432 + 163 = 10595
Step 66: 10595 + 163 = 10758
Step 67: 10758 + 163 = 10921
Step 68: 10921 + 163 = 11084
Step 69: 11084 + 163 = 11247
Step 70: 11247 + 163 = 11410
Step 71: 11410 + 163 = 11573
Step 72: 11573 + 163 = 11736
Step 73: 11736 + 163 = 11899
Step 74: 11899 + 163 = 12062
Step 75: 12062 + 163 = 12225
Step 76: 12225 + 163 = 12388
Step 77: 12388 + 163 = 12551
Step 78: 12551 + 163 = 12714
Step 79: 12714 + 163 = 12877
Step 80: 12877 + 163 = 13040
Step 81: 13040 + 163 = 13203
Step 82: 13203 + 163 = 13366
Step 83: 13366 + 163 = 13529
Step 84: 13529 + 163 = 13692
Step 85: 13692 + 163 = 13855
Step 86: 13855 + 163 = 14018
Step 87: 14018 + 163 = 14181
Step 88: 14181 + 163 = 14344
Step 89: 14344 + 163 = 14507
Step 90: 14507 + 163 = 14670

So, 163*90 = 14670