700 is already rounded to a ten, as in ends in a zero.
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700
700
660 to the nearest ten and 700 to the nearest hundred
The number 657 rounds to 660 when rounded to the nearest ten and 700 when rounded to the nearest hundred. Rounding to the nearest ten involves looking at the digit in the ones place (7 in this case) to determine whether to round up or down. Rounding to the nearest hundred involves looking at the two rightmost digits (57 in this case) to determine whether to round up or down.
690