Oh, dude, 739 to the nearest hundred is 700. Like, you just gotta look at that last digit and decide if it's closer to 700 or 800. It's not rocket science, just basic rounding, man.
3100
Rounded to the nearest tenth, it 147.3. Rounded to the nearest one, it is 147. Rounded to the nearest hundred, it is 100.
It's easier without one. To the nearest hundredth, 5.35 To the nearest hundred, zero.
The nearest ten to 201 is 200, as it is the closest multiple of ten. The nearest hundred is also 200, since it is the closest multiple of one hundred.
1000
one hundred
To the nearest hundred: 400 To the nearest ten: 400 To the nearest one: 396
one hundred million
To the nearest one, 1572 To the nearest hundred, 1600 To the nearest thousand, 2000
To the nearest hundred: 400 To the nearest ten: 440 To the nearest one: 435
To the nearest thousand: 6000 To the nearest hundred: 6300 To the nearest ten: 6280 To the nearest one: 6276
To the nearest thousand: 2000 To the nearest hundred: 2300 To the nearest ten: 2310 To the nearest one: 2305