Round 326 253.9 to the nearest ten thousand.
Round 84 121 638.772 to the nearest hundred thousand.
Fill in the blanks in the following table:
|Number||Number Rounded to the Nearest||Number Rounded to the Nearest||Number Rounded to the Nearest 100||Number Rounded to the Nearest 10||Number Rounded to the Nearest Unit|
A piece of string is measured to be 4.2 cm, correct to the nearest millimeter. Determine, to the nearest thousandth, the relative error of this measurement.