Sure thing! We've got 897 and we're gonna multiply it by 45. That's the same as adding 897 to itself 45 times.
Step 1: 0 + 897 = 897
Step 2: 897 + 897 = 1794
Step 3: 1794 + 897 = 2691
Step 4: 2691 + 897 = 3588
Step 5: 3588 + 897 = 4485
Step 6: 4485 + 897 = 5382
Step 7: 5382 + 897 = 6279
Step 8: 6279 + 897 = 7176
Step 9: 7176 + 897 = 8073
Step 10: 8073 + 897 = 8970
Step 11: 8970 + 897 = 9867
Step 12: 9867 + 897 = 10764
Step 13: 10764 + 897 = 11661
Step 14: 11661 + 897 = 12558
Step 15: 12558 + 897 = 13455
Step 16: 13455 + 897 = 14352
Step 17: 14352 + 897 = 15249
Step 18: 15249 + 897 = 16146
Step 19: 16146 + 897 = 17043
Step 20: 17043 + 897 = 17940
Step 21: 17940 + 897 = 18837
Step 22: 18837 + 897 = 19734
Step 23: 19734 + 897 = 20631
Step 24: 20631 + 897 = 21528
Step 25: 21528 + 897 = 22425
Step 26: 22425 + 897 = 23322
Step 27: 23322 + 897 = 24219
Step 28: 24219 + 897 = 25116
Step 29: 25116 + 897 = 26013
Step 30: 26013 + 897 = 26910
Step 31: 26910 + 897 = 27807
Step 32: 27807 + 897 = 28704
Step 33: 28704 + 897 = 29601
Step 34: 29601 + 897 = 30498
Step 35: 30498 + 897 = 31395
Step 36: 31395 + 897 = 32292
Step 37: 32292 + 897 = 33189
Step 38: 33189 + 897 = 34086
Step 39: 34086 + 897 = 34983
Step 40: 34983 + 897 = 35880
Step 41: 35880 + 897 = 36777
Step 42: 36777 + 897 = 37674
Step 43: 37674 + 897 = 38571
Step 44: 38571 + 897 = 39468
Step 45: 39468 + 897 = 40365

So, 897*45 = 40365