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.
Teach it
Where it is taught, with guided notes, practice, homework, an exit ticket and an interactive Teacher Deck.
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.