Alright, let's solve this math problem step by step. First, we have the number 805. Next, we see the multiplication sign, which means we need to multiply something. And what are we multiplying it by? We multiply it by 42. So, we're going to take the number 805 and add it to itself 42 times.
Step 1: 0 + 805 = 805
Step 2: 805 + 805 = 1610
Step 3: 1610 + 805 = 2415
Step 4: 2415 + 805 = 3220
Step 5: 3220 + 805 = 4025
Step 6: 4025 + 805 = 4830
Step 7: 4830 + 805 = 5635
Step 8: 5635 + 805 = 6440
Step 9: 6440 + 805 = 7245
Step 10: 7245 + 805 = 8050
Step 11: 8050 + 805 = 8855
Step 12: 8855 + 805 = 9660
Step 13: 9660 + 805 = 10465
Step 14: 10465 + 805 = 11270
Step 15: 11270 + 805 = 12075
Step 16: 12075 + 805 = 12880
Step 17: 12880 + 805 = 13685
Step 18: 13685 + 805 = 14490
Step 19: 14490 + 805 = 15295
Step 20: 15295 + 805 = 16100
Step 21: 16100 + 805 = 16905
Step 22: 16905 + 805 = 17710
Step 23: 17710 + 805 = 18515
Step 24: 18515 + 805 = 19320
Step 25: 19320 + 805 = 20125
Step 26: 20125 + 805 = 20930
Step 27: 20930 + 805 = 21735
Step 28: 21735 + 805 = 22540
Step 29: 22540 + 805 = 23345
Step 30: 23345 + 805 = 24150
Step 31: 24150 + 805 = 24955
Step 32: 24955 + 805 = 25760
Step 33: 25760 + 805 = 26565
Step 34: 26565 + 805 = 27370
Step 35: 27370 + 805 = 28175
Step 36: 28175 + 805 = 28980
Step 37: 28980 + 805 = 29785
Step 38: 29785 + 805 = 30590
Step 39: 30590 + 805 = 31395
Step 40: 31395 + 805 = 32200
Step 41: 32200 + 805 = 33005
Step 42: 33005 + 805 = 33810

So, 805*42 = 33810