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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.
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:
By the definition of a subset of a set, the following result is obvious.
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