Khan Academy
Created by experts, Khan Academy’s library of trusted, standards-aligned practice and lessons covers math K-12 through early college, grammar, science, history, AP®, SAT®, and more. It’s all free for learners and teachers.
Khan Academy - 可汗学院
使你的教室与众不同，并激发学生的积极性。. 我们全方位的课程管理系统可供教师们来管理及帮助学生的学习。. 使用过可汗学院课程管理系统的美国教师中有 90% 的教师表示该系统对他们有帮助。. 教师，请从这里开始. 学习者.
Khan Academy
Course: 4th grade math (Illustrative Math-aligned) > Unit 1. Lesson 3: Prime and composite numbers. Prime numbers. Recognizing prime and composite numbers. Prime and composite numbers intro. Identify prime numbers. Identify composite numbers. Prime and composite numbers. Prime and composite numbers review.
Sal Khan - Wikipedia
Sal Khan. Salman " Sal " Amin Khan (born October 11, 1976) is an American educator and the founder of Khan Academy, a free online non-profit educational platform with which he has produced over 6,500 video lessons teaching a wide spectrum of academic subjects, originally focusing on mathematics and science. [1]
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Official Digital SAT® Prep | Khan Academy
SAT practice on Khan Academy is world-class SAT prep that’s effective and 100% free. Encourage your teen to get a head start and practice today! Parents, learn more
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Khan Academy - YouTube
Khan Academy is a nonprofit providing a free, world-class education for anyone, anywhere. Our interactive practice problems, articles, and videos help studen...
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Your AI Tutor: Khanmigo by Khan Academy
Experience the future of learning with Khanmigo, the world's most powerful AI tutor from trusted nonprofit Khan Academy. Learn faster and more effectively than ever before with personalized, 24/7 tutoring tailored to you, your learning history and goals.
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