OK, let's crack this. We're given 531 and our task is to multiply it by 29. Essentially, we'll be adding 531 to itself 29 times.
Step 1: 0 + 531 = 531
Step 2: 531 + 531 = 1062
Step 3: 1062 + 531 = 1593
Step 4: 1593 + 531 = 2124
Step 5: 2124 + 531 = 2655
Step 6: 2655 + 531 = 3186
Step 7: 3186 + 531 = 3717
Step 8: 3717 + 531 = 4248
Step 9: 4248 + 531 = 4779
Step 10: 4779 + 531 = 5310
Step 11: 5310 + 531 = 5841
Step 12: 5841 + 531 = 6372
Step 13: 6372 + 531 = 6903
Step 14: 6903 + 531 = 7434
Step 15: 7434 + 531 = 7965
Step 16: 7965 + 531 = 8496
Step 17: 8496 + 531 = 9027
Step 18: 9027 + 531 = 9558
Step 19: 9558 + 531 = 10089
Step 20: 10089 + 531 = 10620
Step 21: 10620 + 531 = 11151
Step 22: 11151 + 531 = 11682
Step 23: 11682 + 531 = 12213
Step 24: 12213 + 531 = 12744
Step 25: 12744 + 531 = 13275
Step 26: 13275 + 531 = 13806
Step 27: 13806 + 531 = 14337
Step 28: 14337 + 531 = 14868
Step 29: 14868 + 531 = 15399

So, 531*29 = 15399