Let's get this math done. We have 649 and we're going to multiply it by 43. This is the same as taking 649 and adding it to itself 43 times.
Step 1: 0 + 649 = 649
Step 2: 649 + 649 = 1298
Step 3: 1298 + 649 = 1947
Step 4: 1947 + 649 = 2596
Step 5: 2596 + 649 = 3245
Step 6: 3245 + 649 = 3894
Step 7: 3894 + 649 = 4543
Step 8: 4543 + 649 = 5192
Step 9: 5192 + 649 = 5841
Step 10: 5841 + 649 = 6490
Step 11: 6490 + 649 = 7139
Step 12: 7139 + 649 = 7788
Step 13: 7788 + 649 = 8437
Step 14: 8437 + 649 = 9086
Step 15: 9086 + 649 = 9735
Step 16: 9735 + 649 = 10384
Step 17: 10384 + 649 = 11033
Step 18: 11033 + 649 = 11682
Step 19: 11682 + 649 = 12331
Step 20: 12331 + 649 = 12980
Step 21: 12980 + 649 = 13629
Step 22: 13629 + 649 = 14278
Step 23: 14278 + 649 = 14927
Step 24: 14927 + 649 = 15576
Step 25: 15576 + 649 = 16225
Step 26: 16225 + 649 = 16874
Step 27: 16874 + 649 = 17523
Step 28: 17523 + 649 = 18172
Step 29: 18172 + 649 = 18821
Step 30: 18821 + 649 = 19470
Step 31: 19470 + 649 = 20119
Step 32: 20119 + 649 = 20768
Step 33: 20768 + 649 = 21417
Step 34: 21417 + 649 = 22066
Step 35: 22066 + 649 = 22715
Step 36: 22715 + 649 = 23364
Step 37: 23364 + 649 = 24013
Step 38: 24013 + 649 = 24662
Step 39: 24662 + 649 = 25311
Step 40: 25311 + 649 = 25960
Step 41: 25960 + 649 = 26609
Step 42: 26609 + 649 = 27258
Step 43: 27258 + 649 = 27907

So, 649*43 = 27907