Operations on Rational Numbers

Mathematics — First Preparatory

Definition of a rational number

A rational number is a number that can be written in the form a/b, where a and b are integers and b ≠ 0.
The number 5 is rational because it can be written 5/1.
The number −3/4 is rational, and the decimal 0.75 is rational because it equals 3/4.
Every integer is a rational number. A mixed number such as 2 1/3 is changed into an improper fraction: 2 1/3 = 7/3.
The negative sign can be written in the numerator or in front of the fraction. The numbers −2/5, 2/−5 and −(2/5) are all equal.

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