Alright, let's solve this math problem step by step. First, we have the number 872. Next, we see the multiplication sign, which means we need to multiply something. And what are we multiplying it by? We multiply it by 80. So, we're going to take the number 872 and add it to itself 80 times.
Step 1: 0 + 872 = 872
Step 2: 872 + 872 = 1744
Step 3: 1744 + 872 = 2616
Step 4: 2616 + 872 = 3488
Step 5: 3488 + 872 = 4360
Step 6: 4360 + 872 = 5232
Step 7: 5232 + 872 = 6104
Step 8: 6104 + 872 = 6976
Step 9: 6976 + 872 = 7848
Step 10: 7848 + 872 = 8720
Step 11: 8720 + 872 = 9592
Step 12: 9592 + 872 = 10464
Step 13: 10464 + 872 = 11336
Step 14: 11336 + 872 = 12208
Step 15: 12208 + 872 = 13080
Step 16: 13080 + 872 = 13952
Step 17: 13952 + 872 = 14824
Step 18: 14824 + 872 = 15696
Step 19: 15696 + 872 = 16568
Step 20: 16568 + 872 = 17440
Step 21: 17440 + 872 = 18312
Step 22: 18312 + 872 = 19184
Step 23: 19184 + 872 = 20056
Step 24: 20056 + 872 = 20928
Step 25: 20928 + 872 = 21800
Step 26: 21800 + 872 = 22672
Step 27: 22672 + 872 = 23544
Step 28: 23544 + 872 = 24416
Step 29: 24416 + 872 = 25288
Step 30: 25288 + 872 = 26160
Step 31: 26160 + 872 = 27032
Step 32: 27032 + 872 = 27904
Step 33: 27904 + 872 = 28776
Step 34: 28776 + 872 = 29648
Step 35: 29648 + 872 = 30520
Step 36: 30520 + 872 = 31392
Step 37: 31392 + 872 = 32264
Step 38: 32264 + 872 = 33136
Step 39: 33136 + 872 = 34008
Step 40: 34008 + 872 = 34880
Step 41: 34880 + 872 = 35752
Step 42: 35752 + 872 = 36624
Step 43: 36624 + 872 = 37496
Step 44: 37496 + 872 = 38368
Step 45: 38368 + 872 = 39240
Step 46: 39240 + 872 = 40112
Step 47: 40112 + 872 = 40984
Step 48: 40984 + 872 = 41856
Step 49: 41856 + 872 = 42728
Step 50: 42728 + 872 = 43600
Step 51: 43600 + 872 = 44472
Step 52: 44472 + 872 = 45344
Step 53: 45344 + 872 = 46216
Step 54: 46216 + 872 = 47088
Step 55: 47088 + 872 = 47960
Step 56: 47960 + 872 = 48832
Step 57: 48832 + 872 = 49704
Step 58: 49704 + 872 = 50576
Step 59: 50576 + 872 = 51448
Step 60: 51448 + 872 = 52320
Step 61: 52320 + 872 = 53192
Step 62: 53192 + 872 = 54064
Step 63: 54064 + 872 = 54936
Step 64: 54936 + 872 = 55808
Step 65: 55808 + 872 = 56680
Step 66: 56680 + 872 = 57552
Step 67: 57552 + 872 = 58424
Step 68: 58424 + 872 = 59296
Step 69: 59296 + 872 = 60168
Step 70: 60168 + 872 = 61040
Step 71: 61040 + 872 = 61912
Step 72: 61912 + 872 = 62784
Step 73: 62784 + 872 = 63656
Step 74: 63656 + 872 = 64528
Step 75: 64528 + 872 = 65400
Step 76: 65400 + 872 = 66272
Step 77: 66272 + 872 = 67144
Step 78: 67144 + 872 = 68016
Step 79: 68016 + 872 = 68888
Step 80: 68888 + 872 = 69760

So, 872*80 = 69760