Alright, let's solve this math problem step by step. First, we have the number 876. 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 876 and add it to itself 42 times.
Step 1: 0 + 876 = 876
Step 2: 876 + 876 = 1752
Step 3: 1752 + 876 = 2628
Step 4: 2628 + 876 = 3504
Step 5: 3504 + 876 = 4380
Step 6: 4380 + 876 = 5256
Step 7: 5256 + 876 = 6132
Step 8: 6132 + 876 = 7008
Step 9: 7008 + 876 = 7884
Step 10: 7884 + 876 = 8760
Step 11: 8760 + 876 = 9636
Step 12: 9636 + 876 = 10512
Step 13: 10512 + 876 = 11388
Step 14: 11388 + 876 = 12264
Step 15: 12264 + 876 = 13140
Step 16: 13140 + 876 = 14016
Step 17: 14016 + 876 = 14892
Step 18: 14892 + 876 = 15768
Step 19: 15768 + 876 = 16644
Step 20: 16644 + 876 = 17520
Step 21: 17520 + 876 = 18396
Step 22: 18396 + 876 = 19272
Step 23: 19272 + 876 = 20148
Step 24: 20148 + 876 = 21024
Step 25: 21024 + 876 = 21900
Step 26: 21900 + 876 = 22776
Step 27: 22776 + 876 = 23652
Step 28: 23652 + 876 = 24528
Step 29: 24528 + 876 = 25404
Step 30: 25404 + 876 = 26280
Step 31: 26280 + 876 = 27156
Step 32: 27156 + 876 = 28032
Step 33: 28032 + 876 = 28908
Step 34: 28908 + 876 = 29784
Step 35: 29784 + 876 = 30660
Step 36: 30660 + 876 = 31536
Step 37: 31536 + 876 = 32412
Step 38: 32412 + 876 = 33288
Step 39: 33288 + 876 = 34164
Step 40: 34164 + 876 = 35040
Step 41: 35040 + 876 = 35916
Step 42: 35916 + 876 = 36792

So, 876*42 = 36792