OK, let's crack this. We're given 489 and our task is to multiply it by 24. Essentially, we'll be adding 489 to itself 24 times.
Step 1: 0 + 489 = 489
Step 2: 489 + 489 = 978
Step 3: 978 + 489 = 1467
Step 4: 1467 + 489 = 1956
Step 5: 1956 + 489 = 2445
Step 6: 2445 + 489 = 2934
Step 7: 2934 + 489 = 3423
Step 8: 3423 + 489 = 3912
Step 9: 3912 + 489 = 4401
Step 10: 4401 + 489 = 4890
Step 11: 4890 + 489 = 5379
Step 12: 5379 + 489 = 5868
Step 13: 5868 + 489 = 6357
Step 14: 6357 + 489 = 6846
Step 15: 6846 + 489 = 7335
Step 16: 7335 + 489 = 7824
Step 17: 7824 + 489 = 8313
Step 18: 8313 + 489 = 8802
Step 19: 8802 + 489 = 9291
Step 20: 9291 + 489 = 9780
Step 21: 9780 + 489 = 10269
Step 22: 10269 + 489 = 10758
Step 23: 10758 + 489 = 11247
Step 24: 11247 + 489 = 11736

So, 489*24 = 11736