#### Answer

Ten: 3490; Hundred: 3500; Thousand: 3000

#### Work Step by Step

To round to the nearest ten:
1. See digit to the right of the tens place: 7
2. Round up by changing 8 to 9, and change digits to the right to 0.
3. We get 3490 as the new rounded number.
To round to the nearest hundred:
1. See digit to the right of the hundreds place: 8
2. Round up by changing 4 to 5, and change digits to the right to 0.
3. We get 3500 as the new rounded number.
To round to the nearest thousand:
1. See digit to the right of the thousands place: 4
2. Round down by leaving thousands place unchanged and change digits to the right to 0.
3. We get 3000 as the new rounded number.