Alright, let's solve this math problem step by step. First, we have the number 836. 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 836 and add it to itself 45 times.
Step 1: 0 + 836 = 836
Step 2: 836 + 836 = 1672
Step 3: 1672 + 836 = 2508
Step 4: 2508 + 836 = 3344
Step 5: 3344 + 836 = 4180
Step 6: 4180 + 836 = 5016
Step 7: 5016 + 836 = 5852
Step 8: 5852 + 836 = 6688
Step 9: 6688 + 836 = 7524
Step 10: 7524 + 836 = 8360
Step 11: 8360 + 836 = 9196
Step 12: 9196 + 836 = 10032
Step 13: 10032 + 836 = 10868
Step 14: 10868 + 836 = 11704
Step 15: 11704 + 836 = 12540
Step 16: 12540 + 836 = 13376
Step 17: 13376 + 836 = 14212
Step 18: 14212 + 836 = 15048
Step 19: 15048 + 836 = 15884
Step 20: 15884 + 836 = 16720
Step 21: 16720 + 836 = 17556
Step 22: 17556 + 836 = 18392
Step 23: 18392 + 836 = 19228
Step 24: 19228 + 836 = 20064
Step 25: 20064 + 836 = 20900
Step 26: 20900 + 836 = 21736
Step 27: 21736 + 836 = 22572
Step 28: 22572 + 836 = 23408
Step 29: 23408 + 836 = 24244
Step 30: 24244 + 836 = 25080
Step 31: 25080 + 836 = 25916
Step 32: 25916 + 836 = 26752
Step 33: 26752 + 836 = 27588
Step 34: 27588 + 836 = 28424
Step 35: 28424 + 836 = 29260
Step 36: 29260 + 836 = 30096
Step 37: 30096 + 836 = 30932
Step 38: 30932 + 836 = 31768
Step 39: 31768 + 836 = 32604
Step 40: 32604 + 836 = 33440
Step 41: 33440 + 836 = 34276
Step 42: 34276 + 836 = 35112
Step 43: 35112 + 836 = 35948
Step 44: 35948 + 836 = 36784
Step 45: 36784 + 836 = 37620

So, 836*45 = 37620