Let's get this math done. We have 463 and we're going to multiply it by 21. This is the same as taking 463 and adding it to itself 21 times.
Step 1: 0 + 463 = 463
Step 2: 463 + 463 = 926
Step 3: 926 + 463 = 1389
Step 4: 1389 + 463 = 1852
Step 5: 1852 + 463 = 2315
Step 6: 2315 + 463 = 2778
Step 7: 2778 + 463 = 3241
Step 8: 3241 + 463 = 3704
Step 9: 3704 + 463 = 4167
Step 10: 4167 + 463 = 4630
Step 11: 4630 + 463 = 5093
Step 12: 5093 + 463 = 5556
Step 13: 5556 + 463 = 6019
Step 14: 6019 + 463 = 6482
Step 15: 6482 + 463 = 6945
Step 16: 6945 + 463 = 7408
Step 17: 7408 + 463 = 7871
Step 18: 7871 + 463 = 8334
Step 19: 8334 + 463 = 8797
Step 20: 8797 + 463 = 9260
Step 21: 9260 + 463 = 9723

So, 463*21 = 9723