Operations & Algebraic Thinking

Compose and Decompose NumbersKindergartenOpen lesson → Addition Within 10KindergartenOpen lesson → Subtraction Within 10KindergartenOpen lesson → Addition and Subtraction StoriesGrade 1Open lesson → Properties of AdditionGrade 1Open lesson → Addition and Subtraction Within 20Grade 1Open lesson → Unknowns in EquationsGrade 1Open lesson → Addition and Subtraction Within 100Grade 2Open lesson → Equal Groups and ArraysGrade 2Open lesson → Meaning of MultiplicationGrade 3Open lesson → Meaning of DivisionGrade 3Open lesson → Multiplication and Division FactsGrade 3Open lesson → Properties and PatternsGrade 3Open lesson → Multi-Step Word ProblemsGrade 3Open lesson → Factors and MultiplesGrade 4Open lesson → Number and Shape PatternsGrade 4Open lesson → Numerical Expressions and PatternsGrade 5Open lesson → Number OperationsGrades K–5Open lesson →

AdditionGrades K–5Browse 8 lessons ↓

Addition and Subtraction Stories →Addition and Subtraction Within 100 →Addition and Subtraction Within 20 →Addition Within 10 →Multi-Digit Addition and Subtraction →Properties of Addition →Properties of Addition and Multiplication →Relate Addition and Subtraction to Length →

SubtractionGrades K–5Browse 6 lessons ↓

Addition and Subtraction Stories →Addition and Subtraction Within 100 →Addition and Subtraction Within 20 →Multi-Digit Addition and Subtraction →Relate Addition and Subtraction to Length →Subtraction Within 10 →

MultiplicationGrades K–5Browse 5 lessons ↓

Meaning of Multiplication →Multi-Digit Multiplication →Multi-Digit Multiplication and Division →Multiplication and Division Facts →Properties of Addition and Multiplication →

DivisionGrades K–5Browse 4 lessons ↓

Division with Remainders →Meaning of Division →Multi-Digit Multiplication and Division →Multiplication and Division Facts →