OK, let's work through this together. We're starting with 291 and we're going to multiply it by 87, which means we add 291 to itself 87 times.
Step 1: 0 + 291 = 291
Step 2: 291 + 291 = 582
Step 3: 582 + 291 = 873
Step 4: 873 + 291 = 1164
Step 5: 1164 + 291 = 1455
Step 6: 1455 + 291 = 1746
Step 7: 1746 + 291 = 2037
Step 8: 2037 + 291 = 2328
Step 9: 2328 + 291 = 2619
Step 10: 2619 + 291 = 2910
Step 11: 2910 + 291 = 3201
Step 12: 3201 + 291 = 3492
Step 13: 3492 + 291 = 3783
Step 14: 3783 + 291 = 4074
Step 15: 4074 + 291 = 4365
Step 16: 4365 + 291 = 4656
Step 17: 4656 + 291 = 4947
Step 18: 4947 + 291 = 5238
Step 19: 5238 + 291 = 5529
Step 20: 5529 + 291 = 5820
Step 21: 5820 + 291 = 6111
Step 22: 6111 + 291 = 6402
Step 23: 6402 + 291 = 6693
Step 24: 6693 + 291 = 6984
Step 25: 6984 + 291 = 7275
Step 26: 7275 + 291 = 7566
Step 27: 7566 + 291 = 7857
Step 28: 7857 + 291 = 8148
Step 29: 8148 + 291 = 8439
Step 30: 8439 + 291 = 8730
Step 31: 8730 + 291 = 9021
Step 32: 9021 + 291 = 9312
Step 33: 9312 + 291 = 9603
Step 34: 9603 + 291 = 9894
Step 35: 9894 + 291 = 10185
Step 36: 10185 + 291 = 10476
Step 37: 10476 + 291 = 10767
Step 38: 10767 + 291 = 11058
Step 39: 11058 + 291 = 11349
Step 40: 11349 + 291 = 11640
Step 41: 11640 + 291 = 11931
Step 42: 11931 + 291 = 12222
Step 43: 12222 + 291 = 12513
Step 44: 12513 + 291 = 12804
Step 45: 12804 + 291 = 13095
Step 46: 13095 + 291 = 13386
Step 47: 13386 + 291 = 13677
Step 48: 13677 + 291 = 13968
Step 49: 13968 + 291 = 14259
Step 50: 14259 + 291 = 14550
Step 51: 14550 + 291 = 14841
Step 52: 14841 + 291 = 15132
Step 53: 15132 + 291 = 15423
Step 54: 15423 + 291 = 15714
Step 55: 15714 + 291 = 16005
Step 56: 16005 + 291 = 16296
Step 57: 16296 + 291 = 16587
Step 58: 16587 + 291 = 16878
Step 59: 16878 + 291 = 17169
Step 60: 17169 + 291 = 17460
Step 61: 17460 + 291 = 17751
Step 62: 17751 + 291 = 18042
Step 63: 18042 + 291 = 18333
Step 64: 18333 + 291 = 18624
Step 65: 18624 + 291 = 18915
Step 66: 18915 + 291 = 19206
Step 67: 19206 + 291 = 19497
Step 68: 19497 + 291 = 19788
Step 69: 19788 + 291 = 20079
Step 70: 20079 + 291 = 20370
Step 71: 20370 + 291 = 20661
Step 72: 20661 + 291 = 20952
Step 73: 20952 + 291 = 21243
Step 74: 21243 + 291 = 21534
Step 75: 21534 + 291 = 21825
Step 76: 21825 + 291 = 22116
Step 77: 22116 + 291 = 22407
Step 78: 22407 + 291 = 22698
Step 79: 22698 + 291 = 22989
Step 80: 22989 + 291 = 23280
Step 81: 23280 + 291 = 23571
Step 82: 23571 + 291 = 23862
Step 83: 23862 + 291 = 24153
Step 84: 24153 + 291 = 24444
Step 85: 24444 + 291 = 24735
Step 86: 24735 + 291 = 25026
Step 87: 25026 + 291 = 25317

So, 291*87 = 25317