Sure thing, let's get straight to it. We start with 858 and we're going to multiply it by 45, which means adding 858 to itself 45 times.
Step 1: 0 + 858 = 858
Step 2: 858 + 858 = 1716
Step 3: 1716 + 858 = 2574
Step 4: 2574 + 858 = 3432
Step 5: 3432 + 858 = 4290
Step 6: 4290 + 858 = 5148
Step 7: 5148 + 858 = 6006
Step 8: 6006 + 858 = 6864
Step 9: 6864 + 858 = 7722
Step 10: 7722 + 858 = 8580
Step 11: 8580 + 858 = 9438
Step 12: 9438 + 858 = 10296
Step 13: 10296 + 858 = 11154
Step 14: 11154 + 858 = 12012
Step 15: 12012 + 858 = 12870
Step 16: 12870 + 858 = 13728
Step 17: 13728 + 858 = 14586
Step 18: 14586 + 858 = 15444
Step 19: 15444 + 858 = 16302
Step 20: 16302 + 858 = 17160
Step 21: 17160 + 858 = 18018
Step 22: 18018 + 858 = 18876
Step 23: 18876 + 858 = 19734
Step 24: 19734 + 858 = 20592
Step 25: 20592 + 858 = 21450
Step 26: 21450 + 858 = 22308
Step 27: 22308 + 858 = 23166
Step 28: 23166 + 858 = 24024
Step 29: 24024 + 858 = 24882
Step 30: 24882 + 858 = 25740
Step 31: 25740 + 858 = 26598
Step 32: 26598 + 858 = 27456
Step 33: 27456 + 858 = 28314
Step 34: 28314 + 858 = 29172
Step 35: 29172 + 858 = 30030
Step 36: 30030 + 858 = 30888
Step 37: 30888 + 858 = 31746
Step 38: 31746 + 858 = 32604
Step 39: 32604 + 858 = 33462
Step 40: 33462 + 858 = 34320
Step 41: 34320 + 858 = 35178
Step 42: 35178 + 858 = 36036
Step 43: 36036 + 858 = 36894
Step 44: 36894 + 858 = 37752
Step 45: 37752 + 858 = 38610

So, 858*45 = 38610