Sure thing! We've got 499 and we're gonna multiply it by 20. That's the same as adding 499 to itself 20 times.
Step 1: 0 + 499 = 499
Step 2: 499 + 499 = 998
Step 3: 998 + 499 = 1497
Step 4: 1497 + 499 = 1996
Step 5: 1996 + 499 = 2495
Step 6: 2495 + 499 = 2994
Step 7: 2994 + 499 = 3493
Step 8: 3493 + 499 = 3992
Step 9: 3992 + 499 = 4491
Step 10: 4491 + 499 = 4990
Step 11: 4990 + 499 = 5489
Step 12: 5489 + 499 = 5988
Step 13: 5988 + 499 = 6487
Step 14: 6487 + 499 = 6986
Step 15: 6986 + 499 = 7485
Step 16: 7485 + 499 = 7984
Step 17: 7984 + 499 = 8483
Step 18: 8483 + 499 = 8982
Step 19: 8982 + 499 = 9481
Step 20: 9481 + 499 = 9980

So, 499*20 = 9980