# Integers

Though not explicitly tested, the concepts of integers and whole numbers are important to solving GRE math problems.

### Rules

An integer is a number without any fraction or decimal behind it.

1, 3, -5, and 268 are integers, while 1.77 and ${\displaystyle {\tfrac {-2}{7}}}$ are not.

A whole number is a positive integer.

1, 2, and 3 are whole numbers; .62, -8, and Template:Sqrt are not.

### Practice

Determine whether each of the following is an integer, a whole number, or both.

1. -2

2. 113.7

3. ${\displaystyle {\tfrac {5}{6}}}$

3. ${\displaystyle {\tfrac {5}{6}}}$ is not an integer – it is a fraction. Integers, remember, are numbers which do not end in fractions or decimals. Because it is not an integer, it is not a whole number either, since whole numbers are positive integers.