Sometimes it is advantageous to express a value in round numbers. To round to a particular place, look at the digit immediately to the right of the one you want to round to. If that digit is 4, 3, 2, 1 or 0, zero it and everything to the right of it out. If that digit is 5, 6, 7, 8 or 9, increase your target digit by one and zero everything to the right of it out. If your target digit is 9, it will become a zero and increase the digit to the left of it by one.
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To the nearest ten, 70
To the nearest whole number: 520
What would be 159.45 if you round it to the greatest nonzero place
85.5-29.5 round to nearest is 65.25-5.3
9.25 is approximate to:10 to the nearest ten9 to the nearest whole number/unit9.3 to the nearest tenth