OK, let's work through this together. We're starting with 431 and we're going to multiply it by 73, which means we add 431 to itself 73 times.
Step 1: 0 + 431 = 431
Step 2: 431 + 431 = 862
Step 3: 862 + 431 = 1293
Step 4: 1293 + 431 = 1724
Step 5: 1724 + 431 = 2155
Step 6: 2155 + 431 = 2586
Step 7: 2586 + 431 = 3017
Step 8: 3017 + 431 = 3448
Step 9: 3448 + 431 = 3879
Step 10: 3879 + 431 = 4310
Step 11: 4310 + 431 = 4741
Step 12: 4741 + 431 = 5172
Step 13: 5172 + 431 = 5603
Step 14: 5603 + 431 = 6034
Step 15: 6034 + 431 = 6465
Step 16: 6465 + 431 = 6896
Step 17: 6896 + 431 = 7327
Step 18: 7327 + 431 = 7758
Step 19: 7758 + 431 = 8189
Step 20: 8189 + 431 = 8620
Step 21: 8620 + 431 = 9051
Step 22: 9051 + 431 = 9482
Step 23: 9482 + 431 = 9913
Step 24: 9913 + 431 = 10344
Step 25: 10344 + 431 = 10775
Step 26: 10775 + 431 = 11206
Step 27: 11206 + 431 = 11637
Step 28: 11637 + 431 = 12068
Step 29: 12068 + 431 = 12499
Step 30: 12499 + 431 = 12930
Step 31: 12930 + 431 = 13361
Step 32: 13361 + 431 = 13792
Step 33: 13792 + 431 = 14223
Step 34: 14223 + 431 = 14654
Step 35: 14654 + 431 = 15085
Step 36: 15085 + 431 = 15516
Step 37: 15516 + 431 = 15947
Step 38: 15947 + 431 = 16378
Step 39: 16378 + 431 = 16809
Step 40: 16809 + 431 = 17240
Step 41: 17240 + 431 = 17671
Step 42: 17671 + 431 = 18102
Step 43: 18102 + 431 = 18533
Step 44: 18533 + 431 = 18964
Step 45: 18964 + 431 = 19395
Step 46: 19395 + 431 = 19826
Step 47: 19826 + 431 = 20257
Step 48: 20257 + 431 = 20688
Step 49: 20688 + 431 = 21119
Step 50: 21119 + 431 = 21550
Step 51: 21550 + 431 = 21981
Step 52: 21981 + 431 = 22412
Step 53: 22412 + 431 = 22843
Step 54: 22843 + 431 = 23274
Step 55: 23274 + 431 = 23705
Step 56: 23705 + 431 = 24136
Step 57: 24136 + 431 = 24567
Step 58: 24567 + 431 = 24998
Step 59: 24998 + 431 = 25429
Step 60: 25429 + 431 = 25860
Step 61: 25860 + 431 = 26291
Step 62: 26291 + 431 = 26722
Step 63: 26722 + 431 = 27153
Step 64: 27153 + 431 = 27584
Step 65: 27584 + 431 = 28015
Step 66: 28015 + 431 = 28446
Step 67: 28446 + 431 = 28877
Step 68: 28877 + 431 = 29308
Step 69: 29308 + 431 = 29739
Step 70: 29739 + 431 = 30170
Step 71: 30170 + 431 = 30601
Step 72: 30601 + 431 = 31032
Step 73: 31032 + 431 = 31463

So, 431*73 = 31463