Math

Math (X) - Professional (X) - Khan Academy (X)

Equivalent Fractions on the Number Line: Generating Equivalent Fractions

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Create equivalent fractions by dividing a fraction model and number line into smaller parts.

Applying Multiplication and Division: Finding Unknowns

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Learn how to find the missing number in multiplication and division equations.

Fractions and Whole Numbers: Whole Numbers as Fractions

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Use fraction models and a number line to represent the number three as a fraction.

Concept of Multiplication and Division: Introduction to Multiplication

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Use arrays and repeated addition to visualize multiplication.

Multiplying: Four-Digits Times One-Digit, Using a Grid

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It's helpful sometimes to use a grid when multiplying multi-digit numbers. Here's an example.

Subtracting within 1000: Three-Digit Numbers and Regrouping

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When there aren't enough tens (or hundreds, etc.) to subtract with, we can borrow (also called regrouping).

Addition with Carrying: Three-Digit Numbers

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We're going to learn all about carrying when adding a 3 digit number. Join us!

Two-Step Word Problems: Marbles for Friends

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Calculate how many equal shares of his marble collection Bill can give to his classmates.

Arithmetic Warmups: Adding - Base Ten

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Our goal is to understand that the three digits of a three-digit number represent amounts of hundreds, tens, and ones. We'll use a bead counter to help!

Multi-Digit Multiplication: Multiplying by Multiples of 10

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This module shows how to decompose multiples of ten to multiply.

Fractions and Whole Numbers: Different Ways to Represent One as a Fraction

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Use fraction models and a number line to represent the number one as a fraction.

Concept of Multiplication and Division: Multiplication as Groups of Objects

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Use arrays to show different ways to multiply and get the same solution.

Applying Multiplication and Division: Blueberries for Friends

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Use a picture and understanding of multiplication to solve a division word problem.

Adding: Three-Digit Numbers and Regrouping or "Carrying"

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Learn how to add three-digit numbers using regrouping ("carrying") to move the tens (or hundreds or thousands) over to the next column.

Area Basics: Introduction to Area and Unit Squares

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Find the area of figures by covering them with unit squares.

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