Let's get this math done. We have 599 and we're going to multiply it by 25. This is the same as taking 599 and adding it to itself 25 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

So, 599*25 = 14975