Let's roll up our sleeves and solve this. We have 289 and we're going to multiply it by 91, essentially adding 289 to itself 91 times.
Step 1: 0 + 289 = 289
Step 2: 289 + 289 = 578
Step 3: 578 + 289 = 867
Step 4: 867 + 289 = 1156
Step 5: 1156 + 289 = 1445
Step 6: 1445 + 289 = 1734
Step 7: 1734 + 289 = 2023
Step 8: 2023 + 289 = 2312
Step 9: 2312 + 289 = 2601
Step 10: 2601 + 289 = 2890
Step 11: 2890 + 289 = 3179
Step 12: 3179 + 289 = 3468
Step 13: 3468 + 289 = 3757
Step 14: 3757 + 289 = 4046
Step 15: 4046 + 289 = 4335
Step 16: 4335 + 289 = 4624
Step 17: 4624 + 289 = 4913
Step 18: 4913 + 289 = 5202
Step 19: 5202 + 289 = 5491
Step 20: 5491 + 289 = 5780
Step 21: 5780 + 289 = 6069
Step 22: 6069 + 289 = 6358
Step 23: 6358 + 289 = 6647
Step 24: 6647 + 289 = 6936
Step 25: 6936 + 289 = 7225
Step 26: 7225 + 289 = 7514
Step 27: 7514 + 289 = 7803
Step 28: 7803 + 289 = 8092
Step 29: 8092 + 289 = 8381
Step 30: 8381 + 289 = 8670
Step 31: 8670 + 289 = 8959
Step 32: 8959 + 289 = 9248
Step 33: 9248 + 289 = 9537
Step 34: 9537 + 289 = 9826
Step 35: 9826 + 289 = 10115
Step 36: 10115 + 289 = 10404
Step 37: 10404 + 289 = 10693
Step 38: 10693 + 289 = 10982
Step 39: 10982 + 289 = 11271
Step 40: 11271 + 289 = 11560
Step 41: 11560 + 289 = 11849
Step 42: 11849 + 289 = 12138
Step 43: 12138 + 289 = 12427
Step 44: 12427 + 289 = 12716
Step 45: 12716 + 289 = 13005
Step 46: 13005 + 289 = 13294
Step 47: 13294 + 289 = 13583
Step 48: 13583 + 289 = 13872
Step 49: 13872 + 289 = 14161
Step 50: 14161 + 289 = 14450
Step 51: 14450 + 289 = 14739
Step 52: 14739 + 289 = 15028
Step 53: 15028 + 289 = 15317
Step 54: 15317 + 289 = 15606
Step 55: 15606 + 289 = 15895
Step 56: 15895 + 289 = 16184
Step 57: 16184 + 289 = 16473
Step 58: 16473 + 289 = 16762
Step 59: 16762 + 289 = 17051
Step 60: 17051 + 289 = 17340
Step 61: 17340 + 289 = 17629
Step 62: 17629 + 289 = 17918
Step 63: 17918 + 289 = 18207
Step 64: 18207 + 289 = 18496
Step 65: 18496 + 289 = 18785
Step 66: 18785 + 289 = 19074
Step 67: 19074 + 289 = 19363
Step 68: 19363 + 289 = 19652
Step 69: 19652 + 289 = 19941
Step 70: 19941 + 289 = 20230
Step 71: 20230 + 289 = 20519
Step 72: 20519 + 289 = 20808
Step 73: 20808 + 289 = 21097
Step 74: 21097 + 289 = 21386
Step 75: 21386 + 289 = 21675
Step 76: 21675 + 289 = 21964
Step 77: 21964 + 289 = 22253
Step 78: 22253 + 289 = 22542
Step 79: 22542 + 289 = 22831
Step 80: 22831 + 289 = 23120
Step 81: 23120 + 289 = 23409
Step 82: 23409 + 289 = 23698
Step 83: 23698 + 289 = 23987
Step 84: 23987 + 289 = 24276
Step 85: 24276 + 289 = 24565
Step 86: 24565 + 289 = 24854
Step 87: 24854 + 289 = 25143
Step 88: 25143 + 289 = 25432
Step 89: 25432 + 289 = 25721
Step 90: 25721 + 289 = 26010
Step 91: 26010 + 289 = 26299

So, 289*91 = 26299