6th Grade · Expressions & Equations
Open Circle
6.EE.B.8
Definition
A hollow point on a number line showing the boundary value is not part of the solution.
Examples
- An open circle at 3 means 3 is NOT included (x > 3).
- Open (not included) vs. filled (included).
Key rule
An open circle marks a boundary that is not included.
Memory hook
Hollow circle means the boundary doesn't count.