OK, let's work through this together. We're starting with 18 and we're going to multiply it by 29, which means we add 18 to itself 29 times.
Step 1: 0 + 18 = 18
Step 2: 18 + 18 = 36
Step 3: 36 + 18 = 54
Step 4: 54 + 18 = 72
Step 5: 72 + 18 = 90
Step 6: 90 + 18 = 108
Step 7: 108 + 18 = 126
Step 8: 126 + 18 = 144
Step 9: 144 + 18 = 162
Step 10: 162 + 18 = 180
Step 11: 180 + 18 = 198
Step 12: 198 + 18 = 216
Step 13: 216 + 18 = 234
Step 14: 234 + 18 = 252
Step 15: 252 + 18 = 270
Step 16: 270 + 18 = 288
Step 17: 288 + 18 = 306
Step 18: 306 + 18 = 324
Step 19: 324 + 18 = 342
Step 20: 342 + 18 = 360
Step 21: 360 + 18 = 378
Step 22: 378 + 18 = 396
Step 23: 396 + 18 = 414
Step 24: 414 + 18 = 432
Step 25: 432 + 18 = 450
Step 26: 450 + 18 = 468
Step 27: 468 + 18 = 486
Step 28: 486 + 18 = 504
Step 29: 504 + 18 = 522

So, 18*29 = 522