Without delay, let's solve this. We've got 197 and we will be multiplying it by 21, that is, adding 197 to itself 21 times.
Step 1: 0 + 197 = 197
Step 2: 197 + 197 = 394
Step 3: 394 + 197 = 591
Step 4: 591 + 197 = 788
Step 5: 788 + 197 = 985
Step 6: 985 + 197 = 1182
Step 7: 1182 + 197 = 1379
Step 8: 1379 + 197 = 1576
Step 9: 1576 + 197 = 1773
Step 10: 1773 + 197 = 1970
Step 11: 1970 + 197 = 2167
Step 12: 2167 + 197 = 2364
Step 13: 2364 + 197 = 2561
Step 14: 2561 + 197 = 2758
Step 15: 2758 + 197 = 2955
Step 16: 2955 + 197 = 3152
Step 17: 3152 + 197 = 3349
Step 18: 3349 + 197 = 3546
Step 19: 3546 + 197 = 3743
Step 20: 3743 + 197 = 3940
Step 21: 3940 + 197 = 4137

So, 197*21 = 4137