Interval

An interval is a connected piece of the real number line which may be open or closed at either end.

Interval is a middle school-level concept.

Classroom Articles on Pre-Algebra (Up to Middle School Level)

	Absolute Value	Line
	Arithmetic	Origin
	Arithmetic Series	Polynomial
	Associative	Power
	Base	Prime Factor
	Cartesian Coordinates	Prime Factorization
	Commutative	Prime Number
	Decimal Expansion	Pythagorean Theorem
	Distributive	Quotient
	Divisor	Real Line
	Equal	Real Number
	Factorial	Relatively Prime
	Fraction	Right Angle
	Function Graph	Rounding
	Geometric Series	Sequence
	Greatest Common Divisor	Series
	Integer	Set
	Intersection	Square Number
	Irrational Number	Square Root
	Least Common Multiple