# Math

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

## Equivalent Fractions on the Number Line: Generating Equivalent Fractions

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

## Applying Multiplication and Division: Finding Unknowns

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

## Fractions and Whole Numbers: Whole Numbers as Fractions

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

## Concept of Multiplication and Division: Introduction to Multiplication

Icon: Use arrays and repeated addition to visualize multiplication.

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

Icon: 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

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

## Addition with Carrying: Three-Digit Numbers

Icon: ## Two-Step Word Problems: Marbles for Friends

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

## Arithmetic Warmups: Adding - Base Ten

Icon: 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

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

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

Icon: 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

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

## Applying Multiplication and Division: Blueberries for Friends

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

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

Icon: 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

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