It is a question aimed at establishing whether or not you understand the process of rounding.
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To round to the nearest whole number the tenths digit (the one after the decimal point) is the deciding digit whether to round up or down - if it is less than 5 round down, otherwise round up. The tenths digit of 9.13 is 1 which is less than 5 so round down 9.13 → 9 to the nearest whole number.
If you are rounding to the nearest tenth, then since the number next to the tenth is 5 or higher, so it would round to 0.1, and if you round to the nearest one then since the number next to the ones place is 4 or less, it is rounded down to 0
Look at the digit after the ones digit - the tenths digit; if it is 5 or more round up, otherwise it is less than 5 so round down. The tenths digit (the one after the decimal point) is a 9 so round up: 986.91 → 987 to the nearest whole number.
4.489
To the nearest hundred: 400 To the nearest ten: 400 To the nearest one: 396