# Videos

Regroup 1 Ten for 10 Ones
In this video, Marta learns how to regroup tens into ones in order to solve subtraction problems.
Sound Waves, Pitch, and Volume Explained
Explain sound waves with this animation of vibrating keys on a vibraphone. Students will learn about pitch and volume.
Treaty of Versailles
Find information and a short video about the Treaty of Versailles, the end of World War I and the years following, plus the birth of nationalism.?
What Plants Need to Live and Grow
This science video explains why plants need light, water, and space to live and grow.
Adding Decimals Using Mental Math Grade 5
In this video, Carlos learns how to mentally add numbers with decimals.
Combine Volumes of Prisms
In this video, Emily learns how to calculate the volumes of irregular figures by combining volumes.
Dividing 1-Digit Numbers
In this video, Emily learns to divide 3 and 4-digit numbers by 1-digit numbers.
Estimate: Use Compatible Numbers
In this video, Alex and Jada learn to use compatible numbers to simplify complex multiplication.