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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.
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Khan Academy's Mathematics 3 course is built to deliver a comprehensive, illuminating, engaging, and Common Core aligned experience!
Aprenda Matemática, Artes, Programação de Computadores, Economia, Física, Química, Biologia, Medicina, Finanças, História e muito mais, gratuitamente. A Khan Academy é uma organização sem fins lucrativos com a missão de oferecer ensino de qualidade gratuito para qualquer pessoa, em qualquer lugar.
Thư viện tài nguyên của Khan Academy được xây dựng bởi đội ngũ chuyên gia uy tín, bao gồm hệ thống bài giảng và bài tập thực hành các môn toán, khoa học cũng như nhiều bộ môn khác. Và đặc biệt là miễn phí trọn đời với tất cả mọi người.
Kids can also learn independently in the Khan Academy Kids Library—a curated collection of activities, books, videos, and coloring pages. Our book reader allows kids to follow along with recorded audio narration or read on their own across our fiction, non-fiction and fiction leveled books.
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
Learn fifth grade math—arithmetic with fractions and decimals, volume, unit conversion, graphing points, and more. This course is aligned with Common Core standards.
Khan Academy offers free courses in computer programming, covering topics like JavaScript, HTML/CSS, SQL and more.
How can I use Khan Academy to prepare for the Digital SAT? We encourage learners that are looking for more resources to prepare for the Digital SAT to use both Khan Academy's Official Digital SAT Prep for skill practice and College Board's Bluebook app for full-length practice tests.