Alright, let's solve this math problem step by step. First, we have the number 843. Next, we see the multiplication sign, which means we need to multiply something. And what are we multiplying it by? We multiply it by 45. So, we're going to take the number 843 and add it to itself 45 times.
Step 1: 0 + 843 = 843
Step 2: 843 + 843 = 1686
Step 3: 1686 + 843 = 2529
Step 4: 2529 + 843 = 3372
Step 5: 3372 + 843 = 4215
Step 6: 4215 + 843 = 5058
Step 7: 5058 + 843 = 5901
Step 8: 5901 + 843 = 6744
Step 9: 6744 + 843 = 7587
Step 10: 7587 + 843 = 8430
Step 11: 8430 + 843 = 9273
Step 12: 9273 + 843 = 10116
Step 13: 10116 + 843 = 10959
Step 14: 10959 + 843 = 11802
Step 15: 11802 + 843 = 12645
Step 16: 12645 + 843 = 13488
Step 17: 13488 + 843 = 14331
Step 18: 14331 + 843 = 15174
Step 19: 15174 + 843 = 16017
Step 20: 16017 + 843 = 16860
Step 21: 16860 + 843 = 17703
Step 22: 17703 + 843 = 18546
Step 23: 18546 + 843 = 19389
Step 24: 19389 + 843 = 20232
Step 25: 20232 + 843 = 21075
Step 26: 21075 + 843 = 21918
Step 27: 21918 + 843 = 22761
Step 28: 22761 + 843 = 23604
Step 29: 23604 + 843 = 24447
Step 30: 24447 + 843 = 25290
Step 31: 25290 + 843 = 26133
Step 32: 26133 + 843 = 26976
Step 33: 26976 + 843 = 27819
Step 34: 27819 + 843 = 28662
Step 35: 28662 + 843 = 29505
Step 36: 29505 + 843 = 30348
Step 37: 30348 + 843 = 31191
Step 38: 31191 + 843 = 32034
Step 39: 32034 + 843 = 32877
Step 40: 32877 + 843 = 33720
Step 41: 33720 + 843 = 34563
Step 42: 34563 + 843 = 35406
Step 43: 35406 + 843 = 36249
Step 44: 36249 + 843 = 37092
Step 45: 37092 + 843 = 37935

So, 843*45 = 37935