Sure thing, let's get straight to it. We start with 301 and we're going to multiply it by 21, which means adding 301 to itself 21 times.
Step 1: 0 + 301 = 301
Step 2: 301 + 301 = 602
Step 3: 602 + 301 = 903
Step 4: 903 + 301 = 1204
Step 5: 1204 + 301 = 1505
Step 6: 1505 + 301 = 1806
Step 7: 1806 + 301 = 2107
Step 8: 2107 + 301 = 2408
Step 9: 2408 + 301 = 2709
Step 10: 2709 + 301 = 3010
Step 11: 3010 + 301 = 3311
Step 12: 3311 + 301 = 3612
Step 13: 3612 + 301 = 3913
Step 14: 3913 + 301 = 4214
Step 15: 4214 + 301 = 4515
Step 16: 4515 + 301 = 4816
Step 17: 4816 + 301 = 5117
Step 18: 5117 + 301 = 5418
Step 19: 5418 + 301 = 5719
Step 20: 5719 + 301 = 6020
Step 21: 6020 + 301 = 6321

So, 301*21 = 6321