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A number is a mathematical object which is used to count and measure.
Let's recall the classification of numbers that we learned in the previous grades.
![1.png](https://resources.cdn.yaclass.in/cdc81920-8c7e-4230-b32e-6f977976b717/1w600.png)
Important!
- Every natural number is a whole number, integer and rational.
- Every whole number is an integer and rational.
- Every integer is a rational number.
Here come the pictorial forms of the classification of numbers:
![15_1-w500.png](https://resources.cdn.yaclass.in/66c80581-4bbb-4e66-8b21-2fb132de1952/151w500.png)
By the definition of a subset of a set, the following result is obvious.