8th Grade · The Number System
Rational Number
8.EE.C.7b · 8.NS.A.1
Definition
Any number that can be written as a ratio p/q of two integers, where q is not zero. Includes integers, fractions, and terminating or repeating decimals.
Examples
- 3/4, -5/8, and 2/3 are all rational.
- 0.25 = 1/4 and 0.333... = 1/3 are also rational.
Key rule
If it can be written as p/q, it's rational — this includes repeating and terminating decimals.
Memory hook
Any fraction of two integers.