2
2,138.5 rounded to the nearest integer is 2,139
To the nearest integer, 42 To the nearest ten, 40
-13 is an integer.
7.09 rounded to the nearest integer is 7.
1
2
It could be estimated to 17 but for multiplication or division, 100/6 (= 16.66...) would be better.
4 or 5 depending on which way the other numbers in the sum are being estimated.
-39, itself, is the nearest integer.
The nearest integer to 13.5 is 14.
229.00
Yes - 229 has no positive integer factors other than itself and 1.
It is not an integer, nor can it ever be an integer. It can, however, be rounded to the nearest integer, in which case 0.1 will round to 0 to the nearest integer.
2,138.5 rounded to the nearest integer is 2,139
It is already rounded to the nearest integer.
The front end estimate is 3. But sometimes 7/2 ( = 3.5) might be better.