In this video, Marta learns how to use 10-frames and counters to solve an addition problem.

In this video, Carlos uses addition facts and sentences to solve subtraction problems, and learns that addition facts and subtraction facts are related.

In this video, Emily uses cubes to determine whether a number is even or odd by comparing the ones digits.

In this video, Alex learns to add 3-digit numbers using hundreds and tens.

In this video, Alex uses different models like place-value and regrouping to solve subtraction problems.

In this video, Jada uses a number line to do multiplication by skip counting.

In this video, Emily learns how to divide by using repeated subtraction.

In this video, Carlos uses the distributive property to simplify equations with 6 and 7 as factors.

In this video, Carlos uses the facts he's learned to practice multiplication with unknown facts.

In this video, Jackson learns how to use multiplication facts to figure out division facts.

In this video, Emily learns how to calculate the volumes of irregular figures by combining volumes.

In this video, Carlos learns how to round large whole numbers.