800
789 is a whole number.
To one significant number, 800
It is then 19.1 to the nearest tenths
It is 17.9 to the nearest tenths
8.96 to the nearest tenths is 9.0
1000
2.45 to the nearest tenths is 2.5
7.66 to the nearest tenths is 7.7
67.07 to the nearest tenths is 67.1
It is already rounded to the nearest tenths.
116 to the nearest tenths is 116.0