In this video, Carlos learns strategies to add mixed numbers using models.

In this video, Carlos learns strategies to subtract mixed numbers using models.

In this video, Carlos practices more subtraction problems with mixed number models.

In this video, Jackson uses a number line to learn how to subtract.

In this video, Daniel learns the concept of addition using addition sentences.

In this video, Daniel builds a basic equation using an addition sentence, incorporating the + sign and explaining that "and" and "+" mean the same thing.

In this video, Marta learns how to write a subtraction number sentence, and how to use the minus sign.

In this video, Marta learns the concept of capacity, and how to estimate capacity using more, less and simple measuring tools.

In this video, Jackson uses cube trains to learn how to count on to solve addition problems.

In this video, Emily uses an addition fact to solve a subtraction problem.

In this video, Alex learns how to use doubles to solve a series of addition problems.

In this video, Marta learns to fill a 10-frame model to solve an addition problem.