OK, let's crack this. We're given 161 and our task is to multiply it by 43. Essentially, we'll be adding 161 to itself 43 times.
Step 1: 0 + 161 = 161
Step 2: 161 + 161 = 322
Step 3: 322 + 161 = 483
Step 4: 483 + 161 = 644
Step 5: 644 + 161 = 805
Step 6: 805 + 161 = 966
Step 7: 966 + 161 = 1127
Step 8: 1127 + 161 = 1288
Step 9: 1288 + 161 = 1449
Step 10: 1449 + 161 = 1610
Step 11: 1610 + 161 = 1771
Step 12: 1771 + 161 = 1932
Step 13: 1932 + 161 = 2093
Step 14: 2093 + 161 = 2254
Step 15: 2254 + 161 = 2415
Step 16: 2415 + 161 = 2576
Step 17: 2576 + 161 = 2737
Step 18: 2737 + 161 = 2898
Step 19: 2898 + 161 = 3059
Step 20: 3059 + 161 = 3220
Step 21: 3220 + 161 = 3381
Step 22: 3381 + 161 = 3542
Step 23: 3542 + 161 = 3703
Step 24: 3703 + 161 = 3864
Step 25: 3864 + 161 = 4025
Step 26: 4025 + 161 = 4186
Step 27: 4186 + 161 = 4347
Step 28: 4347 + 161 = 4508
Step 29: 4508 + 161 = 4669
Step 30: 4669 + 161 = 4830
Step 31: 4830 + 161 = 4991
Step 32: 4991 + 161 = 5152
Step 33: 5152 + 161 = 5313
Step 34: 5313 + 161 = 5474
Step 35: 5474 + 161 = 5635
Step 36: 5635 + 161 = 5796
Step 37: 5796 + 161 = 5957
Step 38: 5957 + 161 = 6118
Step 39: 6118 + 161 = 6279
Step 40: 6279 + 161 = 6440
Step 41: 6440 + 161 = 6601
Step 42: 6601 + 161 = 6762
Step 43: 6762 + 161 = 6923

So, 161*43 = 6923