You round off the number 16 to the nearest ten by rounding up to 20. You look at the number to the right of the number you want to round, if it is a 5 or above you round up and if it is a 4 or under you round down.
If the decimal is .5 or greater you round up. Such as if a number is 7.5 you round it off to 8.
It would round to 16 as a whole number.
16
16
It is: 16