Whether to round up or down depends on the digit in the units column. If the unit value is less than 5, you round down, if the unit value is 5 or above, round up.
For example:
12 (The unit column contains a 2, which is less than 5, so round down) becomes 10
15 (The unit column contains a 5, which is 5 or above, so round up) becomes 20
907.457 rounded off to nearest tens place is 910. If it were asked to round off to nearest "tenths" place, it would have been 907.5.
1560
7,957,460
The answer is 60
100
100
5400
565
995 to the nearest tens is 1000. When rounding to the nearest tens, you look at the digit in the ones place. If it is 5 or greater, you round up; if it is less than 5, you round down. In this case, the digit in the tens place is 9, which is 5 or greater, so you round up to the nearest tens, which is 1000.
9.99 rounded to the nearest tenth is 10.0
To the nearest tens, it is 560.00
456.82 to the nearest tens place = 460