Sure thing! We've got 441 and we're gonna multiply it by 21. That's the same as adding 441 to itself 21 times.
Step 1: 0 + 441 = 441
Step 2: 441 + 441 = 882
Step 3: 882 + 441 = 1323
Step 4: 1323 + 441 = 1764
Step 5: 1764 + 441 = 2205
Step 6: 2205 + 441 = 2646
Step 7: 2646 + 441 = 3087
Step 8: 3087 + 441 = 3528
Step 9: 3528 + 441 = 3969
Step 10: 3969 + 441 = 4410
Step 11: 4410 + 441 = 4851
Step 12: 4851 + 441 = 5292
Step 13: 5292 + 441 = 5733
Step 14: 5733 + 441 = 6174
Step 15: 6174 + 441 = 6615
Step 16: 6615 + 441 = 7056
Step 17: 7056 + 441 = 7497
Step 18: 7497 + 441 = 7938
Step 19: 7938 + 441 = 8379
Step 20: 8379 + 441 = 8820
Step 21: 8820 + 441 = 9261

So, 441*21 = 9261