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

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

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

Use arrays and repeated addition to visualize multiplication.

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

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

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

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

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!

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

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

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

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

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

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