OK, let's work through this together. We're starting with 323 and we're going to multiply it by 72, which means we add 323 to itself 72 times.
Step 1: 0 + 323 = 323
Step 2: 323 + 323 = 646
Step 3: 646 + 323 = 969
Step 4: 969 + 323 = 1292
Step 5: 1292 + 323 = 1615
Step 6: 1615 + 323 = 1938
Step 7: 1938 + 323 = 2261
Step 8: 2261 + 323 = 2584
Step 9: 2584 + 323 = 2907
Step 10: 2907 + 323 = 3230
Step 11: 3230 + 323 = 3553
Step 12: 3553 + 323 = 3876
Step 13: 3876 + 323 = 4199
Step 14: 4199 + 323 = 4522
Step 15: 4522 + 323 = 4845
Step 16: 4845 + 323 = 5168
Step 17: 5168 + 323 = 5491
Step 18: 5491 + 323 = 5814
Step 19: 5814 + 323 = 6137
Step 20: 6137 + 323 = 6460
Step 21: 6460 + 323 = 6783
Step 22: 6783 + 323 = 7106
Step 23: 7106 + 323 = 7429
Step 24: 7429 + 323 = 7752
Step 25: 7752 + 323 = 8075
Step 26: 8075 + 323 = 8398
Step 27: 8398 + 323 = 8721
Step 28: 8721 + 323 = 9044
Step 29: 9044 + 323 = 9367
Step 30: 9367 + 323 = 9690
Step 31: 9690 + 323 = 10013
Step 32: 10013 + 323 = 10336
Step 33: 10336 + 323 = 10659
Step 34: 10659 + 323 = 10982
Step 35: 10982 + 323 = 11305
Step 36: 11305 + 323 = 11628
Step 37: 11628 + 323 = 11951
Step 38: 11951 + 323 = 12274
Step 39: 12274 + 323 = 12597
Step 40: 12597 + 323 = 12920
Step 41: 12920 + 323 = 13243
Step 42: 13243 + 323 = 13566
Step 43: 13566 + 323 = 13889
Step 44: 13889 + 323 = 14212
Step 45: 14212 + 323 = 14535
Step 46: 14535 + 323 = 14858
Step 47: 14858 + 323 = 15181
Step 48: 15181 + 323 = 15504
Step 49: 15504 + 323 = 15827
Step 50: 15827 + 323 = 16150
Step 51: 16150 + 323 = 16473
Step 52: 16473 + 323 = 16796
Step 53: 16796 + 323 = 17119
Step 54: 17119 + 323 = 17442
Step 55: 17442 + 323 = 17765
Step 56: 17765 + 323 = 18088
Step 57: 18088 + 323 = 18411
Step 58: 18411 + 323 = 18734
Step 59: 18734 + 323 = 19057
Step 60: 19057 + 323 = 19380
Step 61: 19380 + 323 = 19703
Step 62: 19703 + 323 = 20026
Step 63: 20026 + 323 = 20349
Step 64: 20349 + 323 = 20672
Step 65: 20672 + 323 = 20995
Step 66: 20995 + 323 = 21318
Step 67: 21318 + 323 = 21641
Step 68: 21641 + 323 = 21964
Step 69: 21964 + 323 = 22287
Step 70: 22287 + 323 = 22610
Step 71: 22610 + 323 = 22933
Step 72: 22933 + 323 = 23256

So, 323*72 = 23256