Alright, let's solve this math problem step by step. First, we have the number 837. 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 837 and add it to itself 45 times.
Step 1: 0 + 837 = 837
Step 2: 837 + 837 = 1674
Step 3: 1674 + 837 = 2511
Step 4: 2511 + 837 = 3348
Step 5: 3348 + 837 = 4185
Step 6: 4185 + 837 = 5022
Step 7: 5022 + 837 = 5859
Step 8: 5859 + 837 = 6696
Step 9: 6696 + 837 = 7533
Step 10: 7533 + 837 = 8370
Step 11: 8370 + 837 = 9207
Step 12: 9207 + 837 = 10044
Step 13: 10044 + 837 = 10881
Step 14: 10881 + 837 = 11718
Step 15: 11718 + 837 = 12555
Step 16: 12555 + 837 = 13392
Step 17: 13392 + 837 = 14229
Step 18: 14229 + 837 = 15066
Step 19: 15066 + 837 = 15903
Step 20: 15903 + 837 = 16740
Step 21: 16740 + 837 = 17577
Step 22: 17577 + 837 = 18414
Step 23: 18414 + 837 = 19251
Step 24: 19251 + 837 = 20088
Step 25: 20088 + 837 = 20925
Step 26: 20925 + 837 = 21762
Step 27: 21762 + 837 = 22599
Step 28: 22599 + 837 = 23436
Step 29: 23436 + 837 = 24273
Step 30: 24273 + 837 = 25110
Step 31: 25110 + 837 = 25947
Step 32: 25947 + 837 = 26784
Step 33: 26784 + 837 = 27621
Step 34: 27621 + 837 = 28458
Step 35: 28458 + 837 = 29295
Step 36: 29295 + 837 = 30132
Step 37: 30132 + 837 = 30969
Step 38: 30969 + 837 = 31806
Step 39: 31806 + 837 = 32643
Step 40: 32643 + 837 = 33480
Step 41: 33480 + 837 = 34317
Step 42: 34317 + 837 = 35154
Step 43: 35154 + 837 = 35991
Step 44: 35991 + 837 = 36828
Step 45: 36828 + 837 = 37665

So, 837*45 = 37665