.87 to nearest whole number

Answer 1

The same rule is used to either side of the decimal point for rounding.

If the number is abc.efg (where the letters are each just some number)

rounded to the nearest ten ("b" column), all digits to the right of "b" will be cleared and "b" will either stay the same or move up one.

The rounding rule is to use the digit immediately to the right. So, for nearest ten, we look at "c" in the ones column. If "c" is 4 or less, "b" stays put else it moves up.

An example is 789.123

Rounded to the nearest 10, we get 790.000 typically shown as 790 (it rounds "up")

if the "9" had been a "2", we would have rounded down to 780.

SO, considering 0.87, it has a "0" in the ones place (the whole number place). Since "8" is immediately to the right, "0" increases to 1 and we get

1.00 or simply 1 yes

This rounding rule makes sense, as half of our numbers (0,1,2,3,4) mean rounding low/down, half (5,6,7,8,9) mean rounding high/up.