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I can't really tell what some of the questions ask. but a national number is able to written as a fraction.

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for both

https://www.google.com/url?sa=i&url=https%3A%2F%2Fwww.mathwarehouse.com%2Farithmetic%2Fnumbers%2Frational-and-irrational-numbers-with-examples.php&psig=AOvVaw1BDB90y1_Z5rdrjE578VZk&ust=1616778068988000&source=images&cd=vfe&ved=0CAIQjRxqFwoTCOizqeb1y-8CFQAAAAAdAAAAABAD

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one of the most common irrational numbers- Jashaun

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Rational numbers are any number that can be written as a fraction 5, -3

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A number that can be made by dividing two integers (an integer is a number with no fractional part).

The word comes from "ratio".

Examples:
* 1/2 is a rational number (1 divided by 2, or the ratio of 1 to 2)
* 0.75 is a rational number (3/4)
* 1 is a rational number (1/1)
* 2 is a rational number (2/1)
* 2.12 is a rational number (212/100)
* −6.6 is a rational number (−66/10)
* etc

But π (pi) is not a rational number, it is an "Irrational Number".

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A number that can be made by dividing two integers (an integer is a number with no fractional part). The word comes from "ratio".

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Irrational numbers are the real numbers that cannot be represented as a simple fraction. It cannot be expressed in the form of a ratio, such as p/q, where p and q are integers, q≠0. ... For example, √5, √11, √21
Damien Hill

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A number that can be made by dividing two integers (an integer is a number with no fractional part).
Damien Hill
6, 24, 6/3