Let's roll up our sleeves and solve this. We have 432 and we're going to multiply it by 43, essentially adding 432 to itself 43 times.
Step 1: 0 + 432 = 432
Step 2: 432 + 432 = 864
Step 3: 864 + 432 = 1296
Step 4: 1296 + 432 = 1728
Step 5: 1728 + 432 = 2160
Step 6: 2160 + 432 = 2592
Step 7: 2592 + 432 = 3024
Step 8: 3024 + 432 = 3456
Step 9: 3456 + 432 = 3888
Step 10: 3888 + 432 = 4320
Step 11: 4320 + 432 = 4752
Step 12: 4752 + 432 = 5184
Step 13: 5184 + 432 = 5616
Step 14: 5616 + 432 = 6048
Step 15: 6048 + 432 = 6480
Step 16: 6480 + 432 = 6912
Step 17: 6912 + 432 = 7344
Step 18: 7344 + 432 = 7776
Step 19: 7776 + 432 = 8208
Step 20: 8208 + 432 = 8640
Step 21: 8640 + 432 = 9072
Step 22: 9072 + 432 = 9504
Step 23: 9504 + 432 = 9936
Step 24: 9936 + 432 = 10368
Step 25: 10368 + 432 = 10800
Step 26: 10800 + 432 = 11232
Step 27: 11232 + 432 = 11664
Step 28: 11664 + 432 = 12096
Step 29: 12096 + 432 = 12528
Step 30: 12528 + 432 = 12960
Step 31: 12960 + 432 = 13392
Step 32: 13392 + 432 = 13824
Step 33: 13824 + 432 = 14256
Step 34: 14256 + 432 = 14688
Step 35: 14688 + 432 = 15120
Step 36: 15120 + 432 = 15552
Step 37: 15552 + 432 = 15984
Step 38: 15984 + 432 = 16416
Step 39: 16416 + 432 = 16848
Step 40: 16848 + 432 = 17280
Step 41: 17280 + 432 = 17712
Step 42: 17712 + 432 = 18144
Step 43: 18144 + 432 = 18576

So, 432*43 = 18576