https://www.khanacademy.org/math/revision-term-1-ncert-math-class-8-new/x5cae60c7d482f499:week-1/x5cae60c7d482f499:a-square-and-a-cube/v/introduction-to-cubes-and-perfect-cubes 2025-07-15T05:37:43.666736684Z Introduction to cubes and perfect cubes Ever wondered why we call it a “cube”? In this video, we dive into the world of cube numbers, beginning with the geometric origin of the term—imagine a 3D cube with equal sides. If each side is n units long, the total number of unit cubes it contains is n× n × n. That’s where cube numbers come from! We explore what makes a number a perfect cube—like 8, 27, or 64—because they result from cubing a whole number. Then we contrast them with non-perfect cubes, numbers like 9 or 50 that don’t have a neat cube root. Along the way, we use visual models and real-world examples to make each idea stick. Khan Academy video https://cdn.kastatic.org/googleusercontent/ZCdwTudJg6e6n-P2gsaUborP4izvMsGo71pvEVlX9dNYWcLXcP7VHkWpn2grt4TUP1KoJLQP9NswyHBuBLSFTBw Introduction to cubes and perfect cubes Ever wondered why we call it a “cube”? In this video, we dive into the world of cube numbers, beginning with the geometric origin of the term—imagine a 3D cube with equal sides. If each side is n units long, the total number of unit cubes it contains is n× n × n. That’s where cube numbers come from! We explore what makes a number a perfect cube—like 8, 27, or 64—because they result from cubing a whole number. Then we contrast them with non-perfect cubes, numbers like 9 or 50 that don’t have a neat cube root. Along the way, we use visual models and real-world examples to make each idea stick. https://cdn.kastatic.org/ka-youtube-converted/uewgOBpil9Y.mp4/uewgOBpil9Y.mp4 283 Cubic Numbers https://www.khanacademy.org/math/uk-math-class-8/x40384ea0c3a0cfc9:cube-and-cube-roots-ncert-new/x40384ea0c3a0cfc9:cubes/v/adding-consecutive-odd-numbers 2025-05-15T14:44:06.823245258Z Adding consecutive odd numbers In this video, we explore the fascinating mathematical pattern between adding consecutive odd numbers and finding perfect cubes. Through visual representations, we demonstrate how this sequence works and develop methods to find the first number in any such sequence. Students will learn how to apply this pattern to easily calculate cube numbers and solve related problems. This approach transforms abstract number theory into concrete, practical skills that you can apply to various mathematical challenges. Sarath Penumuru video https://cdn.kastatic.org/googleusercontent/ZCdwTudJg6e6n-P2gsaUborP4izvMsGo71pvEVlX9dNYWcLXcP7VHkWpn2grt4TUP1KoJLQP9NswyHBuBLSFTBw Adding consecutive odd numbers In this video, we explore the fascinating mathematical pattern between adding consecutive odd numbers and finding perfect cubes. Through visual representations, we demonstrate how this sequence works and develop methods to find the first number in any such sequence. Students will learn how to apply this pattern to easily calculate cube numbers and solve related problems. This approach transforms abstract number theory into concrete, practical skills that you can apply to various mathematical challenges. https://cdn.kastatic.org/ka-youtube-converted/-KVfOs9H5G0.mp4/-KVfOs9H5G0.mp4 289 Cubic Numbers https://www.khanacademy.org/math/revision-term-1-ka-math-class-8/x36423c781f0794f3:week-3/x36423c781f0794f3:cube-and-cube-roots/e/cube-roots-3-a 2025-02-10T11:15:42.866710478Z Finding cube of numbers, identifying perfect cubes Cube roots ashish exercise https://www.khanacademy.org/math/revision-term-1-ka-math-class-8/x36423c781f0794f3:week-3/x36423c781f0794f3:cube-and-cube-roots/v/intro-to-cube-roots-indian-accent 2025-06-09T09:58:43.937294419Z Intro to cube roots Learn the meaning of cube roots and how to find them. Also learn how to find the cube root of a negative number. Courses on Khan Academy are always 100% free. Start practising—and saving your progress—now! (add course link here) Khan Academy India is a nonprofit organization with the mission of providing a free, world-class education for anyone, anywhere. We have videos and exercises that have been translated into multiple Indian languages, and 15 million people around the globe learn on Khan Academy every month. Support Us: https://india.khanacademy.org/donate Created by Kalakrit (Dubbing) video https://cdn.kastatic.org/googleusercontent/ZCdwTudJg6e6n-P2gsaUborP4izvMsGo71pvEVlX9dNYWcLXcP7VHkWpn2grt4TUP1KoJLQP9NswyHBuBLSFTBw Intro to cube roots Learn the meaning of cube roots and how to find them. Also learn how to find the cube root of a negative number. Courses on Khan Academy are always 100% free. Start practising—and saving your progress—now! (add course link here) Khan Academy India is a nonprofit organization with the mission of providing a free, world-class education for anyone, anywhere. We have videos and exercises that have been translated into multiple Indian languages, and 15 million people around the globe learn on Khan Academy every month. Support Us: https://india.khanacademy.org/donate Created by https://cdn.kastatic.org/ka-youtube-converted/vQhiF0o4ZAM.mp4/vQhiF0o4ZAM.mp4 417 Cubic Numbers https://www.khanacademy.org/math/revision-term-1-ka-math-class-8/x36423c781f0794f3:week-3/x36423c781f0794f3:cube-and-cube-roots/v/cube-root-by-prime-factorisation 2025-05-15T14:44:06.823245258Z Cube root by prime factorisation Confused about cube roots? In this video, we simplify the concept using the prime factorisation method—a powerful tool from your Class 8 NCERT Math syllabus. We start by helping you understand how squares, square roots, cubes, and cube roots are related to prime factors. Then, through clear examples, we show you how to break numbers down and find their cube roots step by step. Why watch this? • Learn the logic behind cube roots (not just tricks) • Solve cube roots of big numbers quickly and accurately • Build a solid foundation for higher-level math Whether you’re preparing for exams or just want to make cube roots less scary, this is the video for you. Sarath Penumuru video https://cdn.kastatic.org/googleusercontent/ZCdwTudJg6e6n-P2gsaUborP4izvMsGo71pvEVlX9dNYWcLXcP7VHkWpn2grt4TUP1KoJLQP9NswyHBuBLSFTBw Cube root by prime factorisation Confused about cube roots? In this video, we simplify the concept using the prime factorisation method—a powerful tool from your Class 8 NCERT Math syllabus. We start by helping you understand how squares, square roots, cubes, and cube roots are related to prime factors. Then, through clear examples, we show you how to break numbers down and find their cube roots step by step. Why watch this? • Learn the logic behind cube roots (not just tricks) • Solve cube roots of big numbers quickly and accurately • Build a solid foundation for higher-level math Whether you’re preparing for exams or just want to make cube roots less scary, this is the video for you. https://cdn.kastatic.org/ka-youtube-converted/omqXGFjpJT0.mp4/omqXGFjpJT0.mp4 393 Cubic Numbers https://www.khanacademy.org/math/algebra/x2f8bb11595b61c86:rational-exponents-radicals/x2f8bb11595b61c86:radicals/e/cube_roots 2025-06-26T20:46:37.500606524Z Cube roots Practice finding the cube root of a perfect cube positive integer. Jeff Ruberg exercise