If you're seeing this message, it means we're having trouble loading external resources on our website.

If you're behind a web filter, please make sure that the domains ***.kastatic.org** and ***.kasandbox.org** are unblocked.

Main content

Start from the basics

Learn the basics, starting with Numbers 0 to 120

Basic addition and subtraction: Addition and subtractionMaking 10: Addition and subtractionAddition and subtraction word problems within 10: Addition and subtractionAddition and subtraction within 20: Addition and subtractionWord problems within 20: Addition and subtractionWord problems with "more" and "fewer": Addition and subtractionIntro to addition with 2-digit numbers: Addition and subtractionIntro to subtraction with 2-digit numbers: Addition and subtractionStrategies for adding and subtracting within 100: Addition and subtraction

Addition within 100: Addition and subtractionSubtraction within 100: Addition and subtractionWord problems within 100: Addition and subtractionAdding 1s, 10s, and 100s: Addition and subtractionSubtracting 1s, 10s, and 100s: Addition and subtractionStrategies for adding 2- and 3-digit numbers: Addition and subtractionAddition with regrouping within 1000: Addition and subtractionSubtraction with regrouping within 1000: Addition and subtractionAddition and subtraction missing value problems: Addition and subtractionAddition and subtraction greater than 1000: Addition and subtraction

Multiplication intro: Multiplication and divisionMultiplication facts: Multiplication and divisionProperties of multiplication : Multiplication and divisionMultiplying by tens: Multiplication and divisionMultiplication by 10s, 100s, and 1000s: Multiplication and divisionMultiplication: place value and area models: Multiplication and divisionMulti-digit multiplication : Multiplication and divisionRelating multiplication and division: Multiplication and division

Division intro: Multiplication and divisionDivision facts: Multiplication and divisionDivision problems that work out nicely: Multiplication and divisionDivision: place value and area: Multiplication and divisionMulti-digit division (no remainders): Multiplication and divisionRemainders: Multiplication and divisionMulti-digit division (remainders): Multiplication and divisionMultiplication and division word problems: Multiplication and division

Fractions intro: FractionsWhat fractions mean: FractionsFractions on the number line: FractionsFractions and whole numbers: FractionsComparing fractions: FractionsEquivalent fractions 1: FractionsEquivalent fractions on the number line: FractionsEquivalent fractions 2: FractionsCommon denominators: FractionsDecomposing fractions: FractionsAdding and subtracting fractions with like denominators: FractionsMixed numbers: FractionsAdding and subtracting mixed numbers: FractionsVisually adding and subtracting fractions with unlike denominators: Fractions

Adding and subtracting fractions with unlike denominators: FractionsAdding and subtracting mixed number with unlike denominators: FractionsAdding and subtracting fractions with unlike denominators word problems: FractionsMultiplying unit fractions and whole numbers: FractionsMultiplying whole numbers and fractions: FractionsMultiplication as scaling: FractionsMultiplying fractions: FractionsMultiplying mixed numbers: FractionsMultiplying fractions word problems: FractionsFractions as division: FractionsDividing unit fractions by whole numbers: FractionsDividing whole numbers by unit fractions: FractionsDividing fractions by fractions: FractionsDividing fractions word problems: Fractions