673 rounded to the nearest ten is 670.
670
670
It is 670.
Rounding 670 to the nearest ten means determining which multiple of ten is closest to 670. In this case, 670 is closer to 670 than to 680, so it rounds down to 670. Rounding to the nearest hundred would result in 700, as 670 is closer to 700 than to 600.
1000
its 670
670
,670
670
670
700