{
  "hint1": "Look at the digit in the 4th decimal place of 499.9999.",
  "hint2": "The 4th digit is 9, which is 5 or more -- round the 3rd digit up. But 3rd, 2nd, and 1st digits are all 9, so the rounding cascades.",
  "hint3": "The cascading rounds 499.9999 up to 500.000 (to 3 decimal places)."
}