In these lessons and examples, we will learn about digits, integers, even and odd integers, operations on even and odd numbers, prime numbers and composite numbers.
We will also learn the following properties of Integers: Commutative Property for Addition, Associative Property for Addition, Distributive Property, Identity Property for Addition, Identity Property for Multiplication, Inverse Property for Addition and Zero Property for Multiplication.
Related Topics: More Lessons on Integers
Introduction to Integers
Digits are the first
concept of integers. There are ten digits namely: 0, 1, 2, 3, 4, 5,
6, 7, 8, 9
In our number system, the position of the digits are
important. For example, consider the number 3,027. This can be
represented in a place value
table as follows:
SAT, the units digit and the ones digit refer to the same digit in a
Integers are whole numbers, for example, –4, –3, –2, –1, 0, 1, 2, 3, 4, ...
Positive integers are all the whole numbers greater than zero, ie: 1, 2, 3, 4, 5, ... We say that its sign is positive. Negative integers are all the whole numbers less than zero, ie: –1, –2, –3, –4, –5, ... We say that its sign is negative.
Integers extend infinitely in both positive and negative directions. This can be represented on the number line.
Zero is an integer that is neither positive nor
Consecutive integers are integers that follow in sequence, each number being 1 more than the previous number, for example 22, 23, 24, 25, ...
Consecutive integers can be more generally represented by n, n +1, n + 2, n + 3, ..., where n is any integer.
Even and Odd Integers
Even integers are integers that can be divided evenly by 2, for example,
–4, –2, 0, 2, 4, ... An even integer always ends in 0, 2, 4, 6, or 8.
Zero is considered an even integer.
Odd integers are integers that cannot be
divided evenly by 2, for example, –5, –3, –1, 1, 3, 5, ... An odd integer always
ends in 1, 3, 5, 7, or 9
To tell whether an integer is even or odd, look at the digit in the
ones place. That single digit will tell you whether the entire integer is odd or even, for example the
integer 3,255 is an odd integer because it ends in 5, an odd integer. Likewise, 702 is an even integer
because it ends in 2.
The following table shows the operations with even and odd integers.
A prime number is a positive integer that has exactly two factors, 1 and itself,
for example 29 has exactly two factors which are 1 and 29. So 29 is a prime number.
On the other hand, 28 has six factors which are 1, 2, 4, 7, 14, and 28. So
28 is not a prime number. It is called a composite number. Some examples of prime numbers
are: 2, 3, 5, 7, 11, 13, 17, 19, ... Since the number 1 has only one factor
(namely 1 itself), it is not a prime number.
The number 2 is the only prime that is even. Other even
numbers will have 2 have as a factor and so will not be a prime.
A number that is not prime is called a composite number.
Properties of Integers
The following are some of the properties of integers. Scroll down the page for more examples and explanations of the different properties of integers.
Operations with Even and Odd Numbers
Add two even numbers and the result is even.
Add two odd numbers and the result is even.
Add one even and one odd and the result is odd.
Multiply two even numbers and the result is even.
Multiply two odd numbers and the result is odd.
Multiply one even and one odd and the result is even.
How to distinguish prime numbers?
A prime number is a number greater than 1, which is only divisible by 1 and itself.
More Properties of Integers
How to identify properties of Integers?
A property is a math rule that is always true.
Commutative Property for Addition, Associative Property for Addition, Distributive Property, Identity Property for Addition, Identity Property for Multiplication, Inverse Property for Addition and Zero Property for Multiplication.
Properties of Integers
Three properties of integers are explained. Additive Identity, Additive Inverse, Opposite of a negative is positive. Examples are provided.
1) Additive Identity: Adding 0 to any integer does not change the value of the integer.
2) Additive Inverse: Each integer has an opposing number (opposite sign). When you add a number and its additive inverse, you get 0.
3) The opposite of a negative is a positive.
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