Sure thing, let's get straight to it. We start with 479 and we're going to multiply it by 21, which means adding 479 to itself 21 times.
Step 1: 0 + 479 = 479
Step 2: 479 + 479 = 958
Step 3: 958 + 479 = 1437
Step 4: 1437 + 479 = 1916
Step 5: 1916 + 479 = 2395
Step 6: 2395 + 479 = 2874
Step 7: 2874 + 479 = 3353
Step 8: 3353 + 479 = 3832
Step 9: 3832 + 479 = 4311
Step 10: 4311 + 479 = 4790
Step 11: 4790 + 479 = 5269
Step 12: 5269 + 479 = 5748
Step 13: 5748 + 479 = 6227
Step 14: 6227 + 479 = 6706
Step 15: 6706 + 479 = 7185
Step 16: 7185 + 479 = 7664
Step 17: 7664 + 479 = 8143
Step 18: 8143 + 479 = 8622
Step 19: 8622 + 479 = 9101
Step 20: 9101 + 479 = 9580
Step 21: 9580 + 479 = 10059

So, 479*21 = 10059