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Watch this video to learn what all living things need: space, air, food, and water.

This video lesson reviews how to rewrite expressions using the properties of operations: the commutative property of addition, the commutative property of multiplication, the associative property of addition, the associative property of multiplication, the identity property of addition, and the identity property of multiplication. This video provides sample problems for your class to solve as you review each property.

How many bricks does Rosa need to make a border around her garden? This video lesson models how students can use what they know about shapes to solve a problem. Students will find the perimeter of the garden by adding the length of all four sides of the square.

This video lesson demonstrates how to use arrays to find products. How many shampoo bottles can the display hold? To solve this problem, students build an array with place value blocks, break apart the array into tens and ones, and write a number sentence to represent this. Then, they add the partial products to find the product of the array.

Did you know most rain in the United States starts as snow? This video explains how water changes state during precipitation, resulting in snow, sleet, hail, or rain.

Explore force, friction, and the movement of objects. This video demonstrates how a student in a wheelchair uses force throughout the day to move objects. Students will learn about contact forces, balanced forces, and unbalanced forces.

Learn about the life cycle of insects. This video explains how caterpillars go through a complete metamorphosis to become a butterfly.

This science video explains the stages in the life cycle of a monarch butterfly.

Watch and learn how scientists use the scientific method to find answers. Do seeds need water to grow? To answer this question, students will make a hypothesis and conduct a science experiment following the steps outlined in this video.

Let's examine bird beak anatomy. Which bird beak can crush seeds – a Heron's or a Cardinal's? Watch the animation in the video to answer this question.

This animation demonstrates Newton's first law of motion, also known as the law of inertia.

This animation shows several stages in a butterfly's life cycle. Pause the video between each stage to compare stages and make predictions.

This science video demonstrates how a graduated cylinder can help scientists observe and measure the volume of a liquid.

Use this short animation to talk about the forces in nature that act on the surfer.

This science video explains why plants need light, water, and space to live and grow.

Explain sound waves with this animation of vibrating keys on a vibraphone. Students will learn about pitch and volume.

A complete sentence requires a subject and predicate, and this video explains how to use both.

Verbs are found in many forms and used in different ways. This grammar video introduces verbs and subject-verb agreement.

Know the punctuation you need in every situation. This grammar song explains when to use commas, parentheses, quotations, semicolons, hyphens, dashes, italics, and underlining.

Contractions are two words joined as one. See how two words become one to form a contraction in this grammar song.

A noun is a word that names a person, animal, place, or thing. Watch this grammar video to learn about common nouns, proper nouns, and appositives.

What's the function of a preposition? This jammin' grammar song reviews the object of the preposition and prepositional phrase in each sentence.

Sing about the function of conjunctions "and," "but," "or," and "so." This grammar song provides examples to help kids learn when to use each conjunction.

Can you spot the preposition? Enhance your grammar lesson with a music video featuring a doo-wop song about prepositions: when we use them, what they do, and how to recognize them.