Without delay, let's solve this. We've got 661 and we will be multiplying it by 43, that is, adding 661 to itself 43 times.
Step 1: 0 + 661 = 661
Step 2: 661 + 661 = 1322
Step 3: 1322 + 661 = 1983
Step 4: 1983 + 661 = 2644
Step 5: 2644 + 661 = 3305
Step 6: 3305 + 661 = 3966
Step 7: 3966 + 661 = 4627
Step 8: 4627 + 661 = 5288
Step 9: 5288 + 661 = 5949
Step 10: 5949 + 661 = 6610
Step 11: 6610 + 661 = 7271
Step 12: 7271 + 661 = 7932
Step 13: 7932 + 661 = 8593
Step 14: 8593 + 661 = 9254
Step 15: 9254 + 661 = 9915
Step 16: 9915 + 661 = 10576
Step 17: 10576 + 661 = 11237
Step 18: 11237 + 661 = 11898
Step 19: 11898 + 661 = 12559
Step 20: 12559 + 661 = 13220
Step 21: 13220 + 661 = 13881
Step 22: 13881 + 661 = 14542
Step 23: 14542 + 661 = 15203
Step 24: 15203 + 661 = 15864
Step 25: 15864 + 661 = 16525
Step 26: 16525 + 661 = 17186
Step 27: 17186 + 661 = 17847
Step 28: 17847 + 661 = 18508
Step 29: 18508 + 661 = 19169
Step 30: 19169 + 661 = 19830
Step 31: 19830 + 661 = 20491
Step 32: 20491 + 661 = 21152
Step 33: 21152 + 661 = 21813
Step 34: 21813 + 661 = 22474
Step 35: 22474 + 661 = 23135
Step 36: 23135 + 661 = 23796
Step 37: 23796 + 661 = 24457
Step 38: 24457 + 661 = 25118
Step 39: 25118 + 661 = 25779
Step 40: 25779 + 661 = 26440
Step 41: 26440 + 661 = 27101
Step 42: 27101 + 661 = 27762
Step 43: 27762 + 661 = 28423

So, 661*43 = 28423