UPSKILL MATH PLUS

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Learn more### Theory:

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.

$\mathrm{\mathbb{N}}\subset W\subset \mathrm{\mathbb{Z}}\phantom{\rule{0.147em}{0ex}}\subset \mathrm{\mathbb{Q}}$