5th Grade at Home by The Princeton Review

Author:The Princeton Review [The Princeton Review]
Language: eng
Format: epub
Publisher: Random House Children's Books
Published: 2021-05-18T00:00:00+00:00

Rational Numbers

Numbers that can be written as fractions (an integer over an integer) are called rational numbers. For example, , , and are all rational numbers. Integers are also rational numbers because they can be written as themselves over 1; for example, 12 can be rewritten as , so it’s a rational number.

Irrational Numbers

Numbers that cannot be rewritten as fractions are called irrational numbers. Some good examples of irrational numbers are , , and π. Roots that can’t be reduced are irrational.

Many people say that π is or 3.14. However, although or 3.14 is close, it is only an approximation, and it is slightly larger than the actual value of π.

Label the following numbers as either rational or irrational.

  –19    –0.2  0.5

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