A number that can be made as a fraction of two integers (an integer itself has no fractional part).
In other words a/b is a rational number when a and b are numbers like -2 or 7 or 123. But be careful: b cannot be zero.
Examples:
• 1/2 is a rational number
• 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)
There are numbers that cannot be written like that, such as π (pi), which is an "Irrational Number".
The word comes from "ratio" (not because they are rational thinkers or anything).
