Sure thing! We've got 444 and we're gonna multiply it by 21. That's the same as adding 444 to itself 21 times.
Step 1: 0 + 444 = 444
Step 2: 444 + 444 = 888
Step 3: 888 + 444 = 1332
Step 4: 1332 + 444 = 1776
Step 5: 1776 + 444 = 2220
Step 6: 2220 + 444 = 2664
Step 7: 2664 + 444 = 3108
Step 8: 3108 + 444 = 3552
Step 9: 3552 + 444 = 3996
Step 10: 3996 + 444 = 4440
Step 11: 4440 + 444 = 4884
Step 12: 4884 + 444 = 5328
Step 13: 5328 + 444 = 5772
Step 14: 5772 + 444 = 6216
Step 15: 6216 + 444 = 6660
Step 16: 6660 + 444 = 7104
Step 17: 7104 + 444 = 7548
Step 18: 7548 + 444 = 7992
Step 19: 7992 + 444 = 8436
Step 20: 8436 + 444 = 8880
Step 21: 8880 + 444 = 9324

So, 444*21 = 9324