Let's roll up our sleeves and solve this. We have 691 and we're going to multiply it by 41, essentially adding 691 to itself 41 times.
Step 1: 0 + 691 = 691
Step 2: 691 + 691 = 1382
Step 3: 1382 + 691 = 2073
Step 4: 2073 + 691 = 2764
Step 5: 2764 + 691 = 3455
Step 6: 3455 + 691 = 4146
Step 7: 4146 + 691 = 4837
Step 8: 4837 + 691 = 5528
Step 9: 5528 + 691 = 6219
Step 10: 6219 + 691 = 6910
Step 11: 6910 + 691 = 7601
Step 12: 7601 + 691 = 8292
Step 13: 8292 + 691 = 8983
Step 14: 8983 + 691 = 9674
Step 15: 9674 + 691 = 10365
Step 16: 10365 + 691 = 11056
Step 17: 11056 + 691 = 11747
Step 18: 11747 + 691 = 12438
Step 19: 12438 + 691 = 13129
Step 20: 13129 + 691 = 13820
Step 21: 13820 + 691 = 14511
Step 22: 14511 + 691 = 15202
Step 23: 15202 + 691 = 15893
Step 24: 15893 + 691 = 16584
Step 25: 16584 + 691 = 17275
Step 26: 17275 + 691 = 17966
Step 27: 17966 + 691 = 18657
Step 28: 18657 + 691 = 19348
Step 29: 19348 + 691 = 20039
Step 30: 20039 + 691 = 20730
Step 31: 20730 + 691 = 21421
Step 32: 21421 + 691 = 22112
Step 33: 22112 + 691 = 22803
Step 34: 22803 + 691 = 23494
Step 35: 23494 + 691 = 24185
Step 36: 24185 + 691 = 24876
Step 37: 24876 + 691 = 25567
Step 38: 25567 + 691 = 26258
Step 39: 26258 + 691 = 26949
Step 40: 26949 + 691 = 27640
Step 41: 27640 + 691 = 28331

So, 691*41 = 28331