OK, let's work through this together. We're starting with 698 and we're going to multiply it by 21, which means we add 698 to itself 21 times.
Step 1: 0 + 698 = 698
Step 2: 698 + 698 = 1396
Step 3: 1396 + 698 = 2094
Step 4: 2094 + 698 = 2792
Step 5: 2792 + 698 = 3490
Step 6: 3490 + 698 = 4188
Step 7: 4188 + 698 = 4886
Step 8: 4886 + 698 = 5584
Step 9: 5584 + 698 = 6282
Step 10: 6282 + 698 = 6980
Step 11: 6980 + 698 = 7678
Step 12: 7678 + 698 = 8376
Step 13: 8376 + 698 = 9074
Step 14: 9074 + 698 = 9772
Step 15: 9772 + 698 = 10470
Step 16: 10470 + 698 = 11168
Step 17: 11168 + 698 = 11866
Step 18: 11866 + 698 = 12564
Step 19: 12564 + 698 = 13262
Step 20: 13262 + 698 = 13960
Step 21: 13960 + 698 = 14658

So, 698*21 = 14658