**Q2: **

Round 326 253.9 to the nearest ten thousand.

- A 320 000
- B 326 000
- C 326 300
- D 330 000

**Q3: **

Round 84 121 638.772 to the nearest hundred thousand.

- A 84 122 000
- B 84 120 000
- C 84 121 600
- D 84 100 000

**Q4: **

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 |
---|---|---|---|---|---|

194 034.854 |

- A 194 034, 190 000, 194 000, 194 000, 194 040
- B 190 000, 194 000, 194 035, 194 030, 194 000
- C 194 034, 190 000, 194 040, 194 000, 194 000
- D 190 000, 194 000, 194 000, 194 030, 194 035

**Q6: **

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.