Regardless of who you are, mastering even just one more skill on Khan Academy results in learning gains.

Learn for free about math, art, computer programming, economics, physics, chemistry, biology, medicine, finance, history, and more. Khan Academy is a nonprofit with the mission of providing a free, world-class education for anyone, anywhere.

खान अकैडमी एक 501 (c) (3) गैर-लाभकारी संगठन है। आज दान कीजिए या वालंटियर करें!

Get ready for 6th grade math! Learn the skills that will set you up for success in ratios, rates, and percentages; arithmetic operations; negative numbers; equations, expressions, and inequalities; and geometry.

भरोसेमंद कॉन्टेंट खान अकैडमी के भरोसेमंद अभ्यास और लेसन विभिन्न विषय-विशेषज्ञों द्वारा तैयार किए गए हैं। इसके अंर्तगत गणित, विज्ञान तथा कई अन्य ...

Learn sixth grade math—ratios, exponents, long division, negative numbers, geometry, statistics, and more. (aligned with Common Core standards)

Test your knowledge of the skills in this course. Start Course challenge

Test your knowledge of the skills in this course. Start Course challenge

Learn high school geometry—transformations, congruence, similarity, trigonometry, analytic geometry, and more. (aligned with Common Core standards)

How do prokaryotic cells look like? What are their features? Watch this video to learn about prokaryotes, specifically, bacteria.