Let's get this math done. We have 198 and we're going to multiply it by 18. This is the same as taking 198 and adding it to itself 18 times.
Step 1: 0 + 198 = 198
Step 2: 198 + 198 = 396
Step 3: 396 + 198 = 594
Step 4: 594 + 198 = 792
Step 5: 792 + 198 = 990
Step 6: 990 + 198 = 1188
Step 7: 1188 + 198 = 1386
Step 8: 1386 + 198 = 1584
Step 9: 1584 + 198 = 1782
Step 10: 1782 + 198 = 1980
Step 11: 1980 + 198 = 2178
Step 12: 2178 + 198 = 2376
Step 13: 2376 + 198 = 2574
Step 14: 2574 + 198 = 2772
Step 15: 2772 + 198 = 2970
Step 16: 2970 + 198 = 3168
Step 17: 3168 + 198 = 3366
Step 18: 3366 + 198 = 3564

So, 198*18 = 3564