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If you're seeing this message, it means we're having trouble loading external resources on our website. If you're behind a web filter, please make sure that the domains *.kastatic.org and *.kasandbox.org are unblocked. Skip to main content To log in and use all the features of Khan Academy, please enable JavaScript in your browser. We've updated our Cookie Notice. Please review it now. Courses * * Math: Pre-K - 8th grade * Pre-K through grade 2 (Khan Kids) * Early math review * 2nd grade * 3rd grade * 4th grade * 5th grade * 6th grade * 7th grade * 8th grade * See Pre-K - 8th grade Math * * Math: Get ready courses * Get ready for 3rd grade * Get ready for 4th grade * Get ready for 5th grade * Get ready for 6th grade * Get ready for 7th grade * Get ready for 8th grade * Get ready for Algebra 1 * Get ready for Geometry * Get ready for Algebra 2 * Get ready for Precalculus * Get ready for AP® Calculus * Get ready for AP® Statistics * * Math: high school & college * Algebra 1 * Geometry * Algebra 2 * Integrated math 1 * Integrated math 2 * Integrated math 3 * Algebra basics * Trigonometry * Precalculus * High school statistics * Statistics & probability * College algebra NEW * AP®︎/College Calculus AB * AP®︎/College Calculus BC * AP®︎/College Statistics * Multivariable calculus * Differential equations * Linear algebra * See all Math * * Test prep * Digital SAT NEW * LSAT * Praxis Core * MCAT * Try the PISA test NEW * * Science * Middle school biology - NGSS NEW * Middle school Earth and space science - NGSS NEW * Middle school physics - NGSS NEW * High school biology * High school biology - NGSS * High school chemistry NEW * High school physics * High school physics - NGSS * AP®︎/College Biology * AP®︎/College Chemistry * AP®︎/College Environmental Science * AP®︎/College Physics 1 * Health and Medicine * See all Science * * Computing * Intro to CS - Python NEW * Computer programming * AP®︎/College Computer Science Principles * Pixar in a Box * See all Computing * * Arts & humanities * US history * AP®︎/College US History * US government and civics * AP®︎/College US Government & Politics * World History Project - Origins to the Present * World History Project - 1750 to the Present * AP®︎/College World History NEW * Big history * Art history * AP®︎/College Art History * Constitution 101 (pilot) * See all Arts & Humanities * * Economics * Macroeconomics * AP®︎/College Macroeconomics * Microeconomics * AP®︎/College Microeconomics * See all Economics * * Reading & language arts * Up to 2nd grade (Khan Kids) * 2nd grade * 3rd grade * 4th grade * 5th grade * 6th grade * 6th grade (expanded) NEW * 7th grade * 8th grade * 9th grade * Grammar * See all Reading & Language Arts * * Life skills * Social & emotional learning (Khan Kids) * Khanmigo for students NEW * AI for education NEW * Financial literacy NEW * Internet safety NEW * Social media literacy NEW * Growth mindset * College admissions * Careers * Personal finance * See all Life Skills * * Partner courses * Ancient Art * Asian Art * Biodiversity * Music * NASA * Natural History * NOVA Labs * Philosophy Search DonateLog inSign up Search for courses, skills, and videos Main content FOR EVERY STUDENT, EVERY CLASSROOM. REAL RESULTS. We’re a nonprofit with the mission to provide a free, world-class education for anyone, anywhere. LearnersTeachersParents Learners, teachers, and parents: Start here Math: Pre-K - 8th grade * Pre-K through grade 2 (Khan Kids) * Early math review * 2nd grade * 3rd grade * 4th grade * 5th grade * 6th grade * 7th grade * 8th grade * See Pre-K - 8th grade Math Math: high school & college * Algebra 1 * Geometry * Algebra 2 * Integrated math 1 * Integrated math 2 * Integrated math 3 * Algebra basics * Trigonometry * Precalculus * High school statistics * Statistics & probability * College algebra * AP®︎/College Calculus AB * AP®︎/College Calculus BC * AP®︎/College Statistics * Multivariable calculus * Differential equations * Linear algebra * See all Math Math: Get ready courses * Get ready for 3rd grade * Get ready for 4th grade * Get ready for 5th grade * Get ready for 6th grade * Get ready for 7th grade * Get ready for 8th grade * Get ready for Algebra 1 * Get ready for Geometry * Get ready for Algebra 2 * Get ready for Precalculus * Get ready for AP® Calculus * Get ready for AP® Statistics Reading & language arts * Up to 2nd grade (Khan Kids) * 2nd grade * 3rd grade * 4th grade * 5th grade * 6th grade * 6th grade (expanded) * 7th grade * 8th grade * 9th grade * Grammar * See all Reading & Language Arts Life skills * Social & emotional learning (Khan Kids) * Khanmigo for students * AI for education * Financial literacy * Internet safety * Social media literacy * Growth mindset * College admissions * Careers * Personal finance * See all Life Skills Science * Middle school biology - NGSS * Middle school Earth and space science - NGSS * Middle school physics - NGSS * High school biology * High school biology - NGSS * High school chemistry * High school physics * High school physics - NGSS * AP®︎/College Biology * AP®︎/College Chemistry * AP®︎/College Environmental Science * AP®︎/College Physics 1 * Health and Medicine * See all Science Test prep * Digital SAT * LSAT * Praxis Core * MCAT * Try the PISA test Computing * Intro to CS - Python * Computer programming * AP®︎/College Computer Science Principles * Pixar in a Box * See all Computing Arts & humanities * US history * AP®︎/College US History * US government and civics * AP®︎/College US Government & Politics * World History Project - Origins to the Present * World History Project - 1750 to the Present * AP®︎/College World History * Big history * Art history * AP®︎/College Art History * Constitution 101 (pilot) * See all Arts & Humanities Economics * Macroeconomics * AP®︎/College Macroeconomics * Microeconomics * AP®︎/College Microeconomics * See all Economics Partner courses * Ancient Art * Asian Art * Biodiversity * Music * NASA * Natural History * NOVA Labs * Philosophy WHY KHAN ACADEMY WORKS PERSONALIZED LEARNING Students practice at their own pace, first filling in gaps in their understanding and then accelerating their learning. TRUSTED CONTENT Created by experts, Khan Academy’s library of trusted practice and lessons covers math, science, and more. Always free for learners and teachers. TOOLS TO EMPOWER TEACHERS With Khan Academy, teachers can identify gaps in their students’ understanding, tailor instruction, and meet the needs of every student. TEACHERS DIFFERENTIATE YOUR CLASSROOM AND ENGAGE EVERY STUDENT. We empower teachers to support their entire classroom. 90% of US teachers who have used Khan Academy have found us effective. Teachers, start here Teachers, start here LEARNERS AND STUDENTS YOU CAN LEARN ANYTHING. Build a deep, solid understanding in math, science, and more. Learners, start here Learners, start here “I come from a poor family. At home it’s one room, just a room we live in. When I was a child, I used to fear mathematics. But now, I am in love with mathematics because of Khan Academy.” ANJALIIndia TOGETHER WE CAN MAKE A DIFFERENCE EVERY CHILD DESERVES THE CHANCE TO LEARN. Across the globe, 617 million children are missing basic math and reading skills. We’re a nonprofit delivering the education they need, and we need your help. You can change the course of a child’s life. Give them the chance Give them the chance JOIN KHAN ACADEMY TODAY LearnersTeachersParentsGive todayBack KEY SUPPORTERS Our mission is to provide a free, world-class education to anyone, anywhere. Khan Academy is a 501(c)(3) nonprofit organization. Donate or volunteer today! 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