The following are true of integers:

• The set of integers includes counting numbers, their opposites, and zero.


• The set of integers is
  {0, 1, ‒1, 2, ‒2, 3, ‒3, . . . } or
  {. . ., –3, –2, –1, 0, 1, 2, 3, . . . }.


• The positive integers are to the right of zero, and negative integers are to the left of zero on a horizontal number line.


• The positive integers are above zero, and the negative integers are below zero on a vertical number line.

Use the link below to further study examples of integers.

Integers Activity

2.5

2.5 is not an integer. It is both a rational number and a real number. The number 2.5 is not a member of the set
{. . ., -3, -2, -1, 0, 1, 2, 3, . . . }.