OK, let's work through this together. We're starting with 198 and we're going to multiply it by 39, which means we add 198 to itself 39 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
Step 24: 4554 + 198 = 4752
Step 25: 4752 + 198 = 4950
Step 26: 4950 + 198 = 5148
Step 27: 5148 + 198 = 5346
Step 28: 5346 + 198 = 5544
Step 29: 5544 + 198 = 5742
Step 30: 5742 + 198 = 5940
Step 31: 5940 + 198 = 6138
Step 32: 6138 + 198 = 6336
Step 33: 6336 + 198 = 6534
Step 34: 6534 + 198 = 6732
Step 35: 6732 + 198 = 6930
Step 36: 6930 + 198 = 7128
Step 37: 7128 + 198 = 7326
Step 38: 7326 + 198 = 7524
Step 39: 7524 + 198 = 7722

So, 198*39 = 7722