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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/2fefd6c5-f228-4cde-af69-58483e4d9058/1-w658.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.