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What is an Integer?

Written by tutor Nikita K.

Integers are negative or positive whole numbers that do not include fractions or decimals. Integers include natural numbers (0, 1, 2, 3, ...) and negative counting numbers (-1, -2, -3, ...).

Examples of integers: -50, -22, -1, 0, 5, 11, 168

Which of the following is an integer?

A. -65/4
B. -5.2
C. 0
D. 1.6
E. 50/3
The correct answer here would be C.

A, B, D, and E all represent numbers that are not whole numbers. They include fractions or decimals.

Which of the following is not an integer?

A. -36/3
B. -12.6
C. 2
D. 12/4
E. 100
The correct answer here would be B.

-36/3 can be simplified to -12, which is an integer, as well as 12/4 which can be represented as 3. 2 an 100 are also integers. The only answer choice that is not a whole number is -12.6.