30
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When you round to the nearest ten, you are looking for numbers like 10, 20, 30, etc. These all have a zero in the ones place. In the case of 34 34 is closest to 30, so you would round it to 30.
It is then 740 when rounded to the nearest ten.
260
320
rounded to the nearest ten... it would be 420.
Rounded to the nearest ten thousands it is 0. In fact, to the nearest ten it is 0.