Let's get this math done. We have 471 and we're going to multiply it by 21. This is the same as taking 471 and adding it to itself 21 times.
Step 1: 0 + 471 = 471
Step 2: 471 + 471 = 942
Step 3: 942 + 471 = 1413
Step 4: 1413 + 471 = 1884
Step 5: 1884 + 471 = 2355
Step 6: 2355 + 471 = 2826
Step 7: 2826 + 471 = 3297
Step 8: 3297 + 471 = 3768
Step 9: 3768 + 471 = 4239
Step 10: 4239 + 471 = 4710
Step 11: 4710 + 471 = 5181
Step 12: 5181 + 471 = 5652
Step 13: 5652 + 471 = 6123
Step 14: 6123 + 471 = 6594
Step 15: 6594 + 471 = 7065
Step 16: 7065 + 471 = 7536
Step 17: 7536 + 471 = 8007
Step 18: 8007 + 471 = 8478
Step 19: 8478 + 471 = 8949
Step 20: 8949 + 471 = 9420
Step 21: 9420 + 471 = 9891

So, 471*21 = 9891