# What is Integer

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Integer is a complete number and it can have a positive sign or a negative sign. Integers are numbers which also include ‘0’, however fractions and decimal numbers are not considered to be integers. So integers are a family of numbers which are ‘0’, positive, or negative, but cannot be fractions or decimal numbers. Examples of integers are: 0, 4, 5, -7, -10, 50, -40, etc. Hence integers are also known as positive or negative counting numbers. Integers can be added, subtracted, multiplied or divided and are used in almost every math calculation.

Example 1: Given the numerical expression, 4+ 5– 9+ 2. Calculate the value of the numerical expression.

Given expression: 4+ 5– 9+ 2
The numbers in the above given expression consist of positive and negative signs and the expression does not contain any fractions or decimals.
Hence the given numbers are all integers!
In order to calculate the value of the given expression, we calculate from left to right.
This gives, 4+ 5– 9+ 2==> 9– 9 + 2==>0+ 2 ==> 2

Therefore the value of the given expression, 4+ 5– 9+ 2= 2

Example 2: Use the operations as shown in the numerical expression, (1* 3) + (5* 2) – (4* 4) and calculate its value

Given numerical expression: (1* 3) + (5* 2) – (4* 4)

The given numbers are all integers since they are no fractions or decimals included.
According to the order of operations, first calculate the numbers inside the parenthesis then multiply and then later add/subtract.
This gives, (1* 3) + (5* 2) – (4* 4) = 3+ 10- 16 = -3

Therefore the value of the given expression is -3.