Sure thing! We've got 927 and we're gonna multiply it by 21. That's the same as adding 927 to itself 21 times.
Step 1: 0 + 927 = 927
Step 2: 927 + 927 = 1854
Step 3: 1854 + 927 = 2781
Step 4: 2781 + 927 = 3708
Step 5: 3708 + 927 = 4635
Step 6: 4635 + 927 = 5562
Step 7: 5562 + 927 = 6489
Step 8: 6489 + 927 = 7416
Step 9: 7416 + 927 = 8343
Step 10: 8343 + 927 = 9270
Step 11: 9270 + 927 = 10197
Step 12: 10197 + 927 = 11124
Step 13: 11124 + 927 = 12051
Step 14: 12051 + 927 = 12978
Step 15: 12978 + 927 = 13905
Step 16: 13905 + 927 = 14832
Step 17: 14832 + 927 = 15759
Step 18: 15759 + 927 = 16686
Step 19: 16686 + 927 = 17613
Step 20: 17613 + 927 = 18540
Step 21: 18540 + 927 = 19467

So, 927*21 = 19467