# Online Basic Math Help

A number is basically a mathematical object used to label, count or measure. They are divided into different categories, such as positive numbers, zero, negative numbers, real numbers and so on. They are considered the main source of mathematics. To deal with all mathematical operations appropriately, it's important to have complete knowledge of numbers.

## Counting Numbers

The universal format of the counting number is 1, 2, 3, and so on. A counting number is also called the non-negative integer or positive integer. The counting numbers cannot be the negative numbers (-85, -79, -45, etc.), decimal numbers, fraction numbers, or zero.

## Operations for Counting Numbers

The counting numbers are used to perform several operations, including subtraction, addition, multiplication, and division. '+' represents addition, '-' represents subtraction, '*' stands for multiplication, and '/' symbolizes division.

## Types of Numbers

There are different types of numbers in use. For instance:

- Whole Numbers : In algebra numbers, the set of number that starts from '0' and goes to infinity is called the whole numbers. Ex: {0,1,2,….}
- Natural Numbers : A set containing all positive, Whole numbers except '0' is called a set of natural numbers. In order to learn algebra numbers properly, it's extremely important to possess completely knowledge of Natural numbers. Ex: {1,2,3….}
- Integers : The integers are basically a combination of Whole numbers and Natural numbers (they include zero, as well as all negative and positive numbers, except decimal numbers). Ex: (… -3,-2,-1, 0, 1, 2, 3…)
- Rational and Irrational Numbers : The rational numbers are the ones that can be expressed in fraction form, whereas irrational numbers are the complete opposite (they cannot be written in fraction form).
- Real Numbers : In a set, the real numbers are the combination of all rational and irrational numbers.
- Odd Numbers: The numbers that cannot be divided by 2 are called odd numbers. Ex: 3,5,7….
- Even Numbers: These are the numbers that can be divided by 2. Ex: 2,4,6….
- Prime Numbers: A natural number that can only be divided by 1 and the number itself is called a prime number – they will always have two divisors only. Ex: 2,5,7….

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