Students in a math class at Seven Springs Middle School in Trinity, Fla., who need extra help with their homework can access help anywhere, anytime using YouTube. The six-minute videos created by their math teacher give students a step-by-step review of lessons, such as the metric system. "They explain everything we learn in class," student Kendra Schlatterer said, adding, "I usually watch them before we have a quiz to help me study."

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