OK, let's crack this. We're given 198 and our task is to multiply it by 23. Essentially, we'll be adding 198 to itself 23 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
Step 19: 3564 + 198 = 3762
Step 20: 3762 + 198 = 3960
Step 21: 3960 + 198 = 4158
Step 22: 4158 + 198 = 4356
Step 23: 4356 + 198 = 4554

So, 198*23 = 4554