Alright, let's solve this math problem step by step. First, we have the number 877. 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 877 and add it to itself 45 times.
Step 1: 0 + 877 = 877
Step 2: 877 + 877 = 1754
Step 3: 1754 + 877 = 2631
Step 4: 2631 + 877 = 3508
Step 5: 3508 + 877 = 4385
Step 6: 4385 + 877 = 5262
Step 7: 5262 + 877 = 6139
Step 8: 6139 + 877 = 7016
Step 9: 7016 + 877 = 7893
Step 10: 7893 + 877 = 8770
Step 11: 8770 + 877 = 9647
Step 12: 9647 + 877 = 10524
Step 13: 10524 + 877 = 11401
Step 14: 11401 + 877 = 12278
Step 15: 12278 + 877 = 13155
Step 16: 13155 + 877 = 14032
Step 17: 14032 + 877 = 14909
Step 18: 14909 + 877 = 15786
Step 19: 15786 + 877 = 16663
Step 20: 16663 + 877 = 17540
Step 21: 17540 + 877 = 18417
Step 22: 18417 + 877 = 19294
Step 23: 19294 + 877 = 20171
Step 24: 20171 + 877 = 21048
Step 25: 21048 + 877 = 21925
Step 26: 21925 + 877 = 22802
Step 27: 22802 + 877 = 23679
Step 28: 23679 + 877 = 24556
Step 29: 24556 + 877 = 25433
Step 30: 25433 + 877 = 26310
Step 31: 26310 + 877 = 27187
Step 32: 27187 + 877 = 28064
Step 33: 28064 + 877 = 28941
Step 34: 28941 + 877 = 29818
Step 35: 29818 + 877 = 30695
Step 36: 30695 + 877 = 31572
Step 37: 31572 + 877 = 32449
Step 38: 32449 + 877 = 33326
Step 39: 33326 + 877 = 34203
Step 40: 34203 + 877 = 35080
Step 41: 35080 + 877 = 35957
Step 42: 35957 + 877 = 36834
Step 43: 36834 + 877 = 37711
Step 44: 37711 + 877 = 38588
Step 45: 38588 + 877 = 39465

So, 877*45 = 39465