OK, let's work through this together. We're starting with 447 and we're going to multiply it by 42, which means we add 447 to itself 42 times.
Step 1: 0 + 447 = 447
Step 2: 447 + 447 = 894
Step 3: 894 + 447 = 1341
Step 4: 1341 + 447 = 1788
Step 5: 1788 + 447 = 2235
Step 6: 2235 + 447 = 2682
Step 7: 2682 + 447 = 3129
Step 8: 3129 + 447 = 3576
Step 9: 3576 + 447 = 4023
Step 10: 4023 + 447 = 4470
Step 11: 4470 + 447 = 4917
Step 12: 4917 + 447 = 5364
Step 13: 5364 + 447 = 5811
Step 14: 5811 + 447 = 6258
Step 15: 6258 + 447 = 6705
Step 16: 6705 + 447 = 7152
Step 17: 7152 + 447 = 7599
Step 18: 7599 + 447 = 8046
Step 19: 8046 + 447 = 8493
Step 20: 8493 + 447 = 8940
Step 21: 8940 + 447 = 9387
Step 22: 9387 + 447 = 9834
Step 23: 9834 + 447 = 10281
Step 24: 10281 + 447 = 10728
Step 25: 10728 + 447 = 11175
Step 26: 11175 + 447 = 11622
Step 27: 11622 + 447 = 12069
Step 28: 12069 + 447 = 12516
Step 29: 12516 + 447 = 12963
Step 30: 12963 + 447 = 13410
Step 31: 13410 + 447 = 13857
Step 32: 13857 + 447 = 14304
Step 33: 14304 + 447 = 14751
Step 34: 14751 + 447 = 15198
Step 35: 15198 + 447 = 15645
Step 36: 15645 + 447 = 16092
Step 37: 16092 + 447 = 16539
Step 38: 16539 + 447 = 16986
Step 39: 16986 + 447 = 17433
Step 40: 17433 + 447 = 17880
Step 41: 17880 + 447 = 18327
Step 42: 18327 + 447 = 18774

So, 447*42 = 18774