OK, let's crack this. We're given 599 and our task is to multiply it by 39. Essentially, we'll be adding 599 to itself 39 times.
Step 1: 0 + 599 = 599
Step 2: 599 + 599 = 1198
Step 3: 1198 + 599 = 1797
Step 4: 1797 + 599 = 2396
Step 5: 2396 + 599 = 2995
Step 6: 2995 + 599 = 3594
Step 7: 3594 + 599 = 4193
Step 8: 4193 + 599 = 4792
Step 9: 4792 + 599 = 5391
Step 10: 5391 + 599 = 5990
Step 11: 5990 + 599 = 6589
Step 12: 6589 + 599 = 7188
Step 13: 7188 + 599 = 7787
Step 14: 7787 + 599 = 8386
Step 15: 8386 + 599 = 8985
Step 16: 8985 + 599 = 9584
Step 17: 9584 + 599 = 10183
Step 18: 10183 + 599 = 10782
Step 19: 10782 + 599 = 11381
Step 20: 11381 + 599 = 11980
Step 21: 11980 + 599 = 12579
Step 22: 12579 + 599 = 13178
Step 23: 13178 + 599 = 13777
Step 24: 13777 + 599 = 14376
Step 25: 14376 + 599 = 14975
Step 26: 14975 + 599 = 15574
Step 27: 15574 + 599 = 16173
Step 28: 16173 + 599 = 16772
Step 29: 16772 + 599 = 17371
Step 30: 17371 + 599 = 17970
Step 31: 17970 + 599 = 18569
Step 32: 18569 + 599 = 19168
Step 33: 19168 + 599 = 19767
Step 34: 19767 + 599 = 20366
Step 35: 20366 + 599 = 20965
Step 36: 20965 + 599 = 21564
Step 37: 21564 + 599 = 22163
Step 38: 22163 + 599 = 22762
Step 39: 22762 + 599 = 23361

So, 599*39 = 23361