OK, let's crack this. We're given 373 and our task is to multiply it by 45. Essentially, we'll be adding 373 to itself 45 times.
Step 1: 0 + 373 = 373
Step 2: 373 + 373 = 746
Step 3: 746 + 373 = 1119
Step 4: 1119 + 373 = 1492
Step 5: 1492 + 373 = 1865
Step 6: 1865 + 373 = 2238
Step 7: 2238 + 373 = 2611
Step 8: 2611 + 373 = 2984
Step 9: 2984 + 373 = 3357
Step 10: 3357 + 373 = 3730
Step 11: 3730 + 373 = 4103
Step 12: 4103 + 373 = 4476
Step 13: 4476 + 373 = 4849
Step 14: 4849 + 373 = 5222
Step 15: 5222 + 373 = 5595
Step 16: 5595 + 373 = 5968
Step 17: 5968 + 373 = 6341
Step 18: 6341 + 373 = 6714
Step 19: 6714 + 373 = 7087
Step 20: 7087 + 373 = 7460
Step 21: 7460 + 373 = 7833
Step 22: 7833 + 373 = 8206
Step 23: 8206 + 373 = 8579
Step 24: 8579 + 373 = 8952
Step 25: 8952 + 373 = 9325
Step 26: 9325 + 373 = 9698
Step 27: 9698 + 373 = 10071
Step 28: 10071 + 373 = 10444
Step 29: 10444 + 373 = 10817
Step 30: 10817 + 373 = 11190
Step 31: 11190 + 373 = 11563
Step 32: 11563 + 373 = 11936
Step 33: 11936 + 373 = 12309
Step 34: 12309 + 373 = 12682
Step 35: 12682 + 373 = 13055
Step 36: 13055 + 373 = 13428
Step 37: 13428 + 373 = 13801
Step 38: 13801 + 373 = 14174
Step 39: 14174 + 373 = 14547
Step 40: 14547 + 373 = 14920
Step 41: 14920 + 373 = 15293
Step 42: 15293 + 373 = 15666
Step 43: 15666 + 373 = 16039
Step 44: 16039 + 373 = 16412
Step 45: 16412 + 373 = 16785

So, 373*45 = 16785