https://www.khanacademy.org/math/class-6-ncf/x04ca845a9a148c80:prime-time/x04ca845a9a148c80:prime-numbers/v/recognizing-prime-and-composite-numbers-indian-accent 2025-05-30T05:30:36.604331212Z Recognizing prime and composite numbers Can you recognize the prime numbers in this group of numbers? Which are prime, composite, or neither? Skyloom (Dubbing) video https://cdn.kastatic.org/googleusercontent/ZCdwTudJg6e6n-P2gsaUborP4izvMsGo71pvEVlX9dNYWcLXcP7VHkWpn2grt4TUP1KoJLQP9NswyHBuBLSFTBw Recognizing prime and composite numbers Can you recognize the prime numbers in this group of numbers? Which are prime, composite, or neither? https://cdn.kastatic.org/ka-youtube-converted/e7A9RLC_rS4.mp4/e7A9RLC_rS4.mp4 275 Finding Common Ground https://www.khanacademy.org/math/class-6-ncf/x04ca845a9a148c80:prime-time/x04ca845a9a148c80:prime-factorization/v/prime-factorization-exercise-india 2025-03-28T07:16:04.402919306Z Prime factorization exercise Prime factorization exercise (Indian Accent) Aakash Bagga video https://cdn.kastatic.org/googleusercontent/ZCdwTudJg6e6n-P2gsaUborP4izvMsGo71pvEVlX9dNYWcLXcP7VHkWpn2grt4TUP1KoJLQP9NswyHBuBLSFTBw Prime factorization exercise Prime factorization exercise (Indian Accent) https://cdn.kastatic.org/ka-youtube-converted/aqO-WK1SkSc.mp4/aqO-WK1SkSc.mp4 229 Finding Common Ground https://www.khanacademy.org/math/pre-algebra/pre-algebra-factors-multiples/pre-algebra-prime-factorization-prealg/e/prime_factorization 2025-02-25T11:20:34.857789849Z Prime factorization Factor two-digit numbers into their prime factorizations. Marcia Lee exercise https://www.khanacademy.org/math/class-6-ncf/x04ca845a9a148c80:prime-time/x04ca845a9a148c80:common-multiples-and-common-factors/v/finding-factors-and-multiples-indian-accent 2025-06-05T06:01:43.515132284Z Finding factors and multiples Sal uses divisibility rules to determine if numbers are factors of 154 and then finds multiples of 14. Skyloom (Dubbing) video https://cdn.kastatic.org/googleusercontent/ZCdwTudJg6e6n-P2gsaUborP4izvMsGo71pvEVlX9dNYWcLXcP7VHkWpn2grt4TUP1KoJLQP9NswyHBuBLSFTBw Finding factors and multiples Sal uses divisibility rules to determine if numbers are factors of 154 and then finds multiples of 14. https://cdn.kastatic.org/ka-youtube-converted/-R8VD80xia8.mp4/-R8VD80xia8.mp4 246 Finding Common Ground https://www.khanacademy.org/math/cc-fourth-grade-math/imp-factors-multiples-and-patterns/imp-factors-and-multiples/e/identify-factors 2023-07-11T22:33:39.846621515Z Identify factors Find all the factors of a number within 100. Lindsay exercise https://www.khanacademy.org/math/cc-fourth-grade-math/imp-factors-multiples-and-patterns/imp-factors-and-multiples/e/identify-multiples 2022-07-26T19:59:03.453693248Z Identify multiples Practice using skip counting and division to identify multiples of a given number. Lindsay exercise https://www.khanacademy.org/math/class-6-ncf/x04ca845a9a148c80:prime-time/x04ca845a9a148c80:common-multiples-and-common-factors/e/lcm-and-hcf-10-a 2025-03-26T11:06:05.76570606Z Factors and multiples of a number LCM and HCF ashish exercise https://www.khanacademy.org/math/class-6-ncf/x04ca845a9a148c80:prime-time/x04ca845a9a148c80:common-multiples-and-common-factors/v/common-factors-and-common-multiples 2024-05-29T07:44:09.146521489Z Common factors and common multiples Description In this video we discuss the concept of common factors and then common multiples and also the foundation that builds HCF and LCM Devashish Phadnis video https://cdn.kastatic.org/googleusercontent/ZCdwTudJg6e6n-P2gsaUborP4izvMsGo71pvEVlX9dNYWcLXcP7VHkWpn2grt4TUP1KoJLQP9NswyHBuBLSFTBw Common factors and common multiples Description In this video we discuss the concept of common factors and then common multiples and also the foundation that builds HCF and LCM https://cdn.kastatic.org/ka-youtube-converted/eTvTj1j2cSI.mp4/eTvTj1j2cSI.mp4 416 Finding Common Ground https://www.khanacademy.org/math/class-6-ncf/x04ca845a9a148c80:prime-time/x04ca845a9a148c80:common-multiples-and-common-factors/e/identify-common-factors 2024-07-22T11:22:12.685922863Z Identify common factors Identify the common factors for two numbers. Aanand exercise https://www.khanacademy.org/math/class-7-ncf/x063f95a40c290960:finding-common-ground/x063f95a40c290960:hcf/v/hcf-visualized 2020-10-07T19:09:54Z HCF visualized Finding the HCF from prime factors can sometimes be hard to imagine. Let's look at an interesting way to visualise finding the HCF of two numbers using prime factorisation. Created by Aanand Srinivas video https://cdn.kastatic.org/googleusercontent/lf55e_rmF4FVVOKMq3UTW3HAGBxO6L4tYBOir6rzvjYkID7O-ScKHuUL1Zpz2_adeYSLRUujweUj7xBXUwjw66Ls HCF visualized Finding the HCF from prime factors can sometimes be hard to imagine. Let's look at an interesting way to visualise finding the HCF of two numbers using prime factorisation. Created by https://cdn.kastatic.org/ka-youtube-converted/egf7bSeo4P4.mp4/egf7bSeo4P4.mp4 511 Finding Common Ground https://www.khanacademy.org/math/class-7-ncf/x063f95a40c290960:finding-common-ground/x063f95a40c290960:hcf/v/greatest-common-factor-explained-indian-accent 2025-06-06T15:33:38.563209632Z Greatest common factor explained The greatest common divisor (GCD) and greatest common factor (GCF) are the same thing. To find the GCD/GCF of two numbers, list their factors, identify the common factors, and choose the largest one. For example, the GCD/GCF of 12 and 8 is 4. Numbers with a GCD/GCF of 1 are called relatively prime. Skyloom (Dubbing) video https://cdn.kastatic.org/googleusercontent/ZCdwTudJg6e6n-P2gsaUborP4izvMsGo71pvEVlX9dNYWcLXcP7VHkWpn2grt4TUP1KoJLQP9NswyHBuBLSFTBw Greatest common factor explained The greatest common divisor (GCD) and greatest common factor (GCF) are the same thing. To find the GCD/GCF of two numbers, list their factors, identify the common factors, and choose the largest one. For example, the GCD/GCF of 12 and 8 is 4. Numbers with a GCD/GCF of 1 are called relatively prime. https://cdn.kastatic.org/ka-youtube-converted/ZPSLKiFj4zU.mp4/ZPSLKiFj4zU.mp4 386 Finding Common Ground https://www.khanacademy.org/math/cc-sixth-grade-math/cc-6th-expressions-and-variables/cc-6th-gcf/e/greatest_common_divisor 2022-02-04T17:27:52.270593234Z Greatest common factor Find the greatest common factor of 2 or 3 integers. Marcia Lee exercise https://www.khanacademy.org/math/class-7-ncf/x063f95a40c290960:finding-common-ground/x063f95a40c290960:hcf/e/hcf-highest-common-factor-word-problems 2025-05-01T15:55:07.98183596Z HCF (highest common factor) word problems Practice solving word problems on the highest common factor (HCF). Nurun Nahar Moon exercise https://www.khanacademy.org/math/class-7-ncf/x063f95a40c290960:finding-common-ground/x063f95a40c290960:lcm/v/lcm-visualized 2020-10-07T19:09:50Z LCM visualized It can be a bit tricky at first to visualize finding the LCM using prime factorization. Let's look at an interesting way to visualize the HCF and the LCM of two numbers in a diagram. Created by Aanand Srinivas. Aanand Srinivas video https://cdn.kastatic.org/googleusercontent/gF3yYKxTe2VQkFxZSeU0-d0Uk7QvbcLUFToPBdikP3rxo1zJ_1buFenljk05-0NdAMwrcOCB2If5nzypbTKgX3fLmQ LCM visualized It can be a bit tricky at first to visualize finding the LCM using prime factorization. Let's look at an interesting way to visualize the HCF and the LCM of two numbers in a diagram. Created by Aanand Srinivas. https://cdn.kastatic.org/ka-youtube-converted/CR3K9muZJlk.mp4/CR3K9muZJlk.mp4 671 Finding Common Ground https://www.khanacademy.org/math/revision-mh-math-class-6/x01cb2212e31ce997:decimal-fractions/x01cb2212e31ce997:divisibility-hcf-lcm/v/least-common-multiple-indian-accent 2025-06-05T06:01:43.515132284Z Least common multiple The least common multiple (LCM) is the smallest number that two or more numbers can divide into evenly. To find the LCM, you can use the prime factorization method or list the multiples of each number. Prime factorization involves breaking down numbers into their prime factors and constructing the smallest number with all the factors. Listing multiples involves finding the smallest shared multiple. Both methods help find the LCM of numbers like 18 and 12. Skyloom (Dubbing) video https://cdn.kastatic.org/googleusercontent/ZCdwTudJg6e6n-P2gsaUborP4izvMsGo71pvEVlX9dNYWcLXcP7VHkWpn2grt4TUP1KoJLQP9NswyHBuBLSFTBw Least common multiple The least common multiple (LCM) is the smallest number that two or more numbers can divide into evenly. To find the LCM, you can use the prime factorization method or list the multiples of each number. Prime factorization involves breaking down numbers into their prime factors and constructing the smallest number with all the factors. Listing multiples involves finding the smallest shared multiple. Both methods help find the LCM of numbers like 18 and 12. https://cdn.kastatic.org/ka-youtube-converted/hAaZD9T7xJk.mp4/hAaZD9T7xJk.mp4 265 Finding Common Ground https://www.khanacademy.org/math/cc-sixth-grade-math/cc-6th-expressions-and-variables/cc-6th-lcm/v/least-common-multiple-exercise-2 2022-11-16T04:22:43.7414897Z Least common multiple: repeating factors To find the Least Common Multiple (LCM) of two integers, follow these steps: 1) Find the prime factorization of both numbers. 2) Determine which prime factors are needed for the least common multiple (LCM) to be divisible by both numbers. 3) Multiply the necessary prime factors together to get the least common multiple (LCM). Sal Khan video https://cdn.kastatic.org/googleusercontent/MtOMfL5jSvZZDyTzPShTtYObW6HdZ1wtvYOW77m7lZp_CvZ1UP2qOkkNGaeJ5sUQ_KzQLrzfUHKIsAYLbDYu3ev5NA Least common multiple: repeating factors To find the Least Common Multiple (LCM) of two integers, follow these steps: 1) Find the prime factorization of both numbers. 2) Determine which prime factors are needed for the least common multiple (LCM) to be divisible by both numbers. 3) Multiply the necessary prime factors together to get the least common multiple (LCM). https://cdn.kastatic.org/ka-youtube-converted/QUem_2dkB9I.mp4/QUem_2dkB9I.mp4 155 Finding Common Ground https://www.khanacademy.org/math/cc-sixth-grade-math/cc-6th-expressions-and-variables/cc-6th-lcm/v/least-common-multiple-lcm 2023-05-23T10:28:13.689545116Z Least common multiple of three numbers The least common multiple (LCM) is the smallest number that is a multiple of two or more numbers. To find the LCM, you can list the multiples of each number and find the smallest one they share, or use prime factorization to break down the numbers into their prime factors and multiply the highest powers of each factor. Sal Khan video https://cdn.kastatic.org/googleusercontent/AekFmhZdo5bmZkDGP-cK3HTMNKdXZI_ahtN099adj4L3sA_nEh-7bT__3uX7ivHRnKestKa_hJ352VXCizqYuXpv Least common multiple of three numbers The least common multiple (LCM) is the smallest number that is a multiple of two or more numbers. To find the LCM, you can list the multiples of each number and find the smallest one they share, or use prime factorization to break down the numbers into their prime factors and multiply the highest powers of each factor. https://cdn.kastatic.org/ka-youtube-converted/D6yHKOYJiso.mp4/D6yHKOYJiso.mp4 324 Finding Common Ground https://www.khanacademy.org/math/cc-sixth-grade-math/cc-6th-expressions-and-variables/cc-6th-lcm/e/least_common_multiple 2021-06-30T17:51:15Z Least common multiple Find the lcm (least common multiple) of pairs of integers. Marcia Lee exercise https://www.khanacademy.org/math/class-7-ncf/x063f95a40c290960:finding-common-ground/x063f95a40c290960:lcm/e/lcm-least-common-multiple-word-problem 2025-07-02T18:24:13.072452471Z LCM (least common multiple) word problem Practice solving word problems on the least common multiple (LCM). Nurun Nahar Moon exercise https://www.khanacademy.org/math/class-7-ncf/x063f95a40c290960:finding-common-ground/x063f95a40c290960:lcm/e/lcm-of-three-numbers 2024-05-29T07:44:09.146521489Z LCM of three numbers In this exercise we find the LCM of three numbers. This exercise is curated for the syllabus of new NCERT 2024 Devashish Phadnis exercise https://www.khanacademy.org/math/class-7-ncf/x063f95a40c290960:finding-common-ground/x063f95a40c290960:lcm/v/efficient-method-for-hcf-and-lcm 2026-01-13T05:46:23.044828344Z Efficient Method for HCF and LCM In this video, we discuss a neat technique to find HCF and LCM with lessers number of steps compared to the standard procedure. Khan Academy video https://cdn.kastatic.org/googleusercontent/ZCdwTudJg6e6n-P2gsaUborP4izvMsGo71pvEVlX9dNYWcLXcP7VHkWpn2grt4TUP1KoJLQP9NswyHBuBLSFTBw Efficient Method for HCF and LCM In this video, we discuss a neat technique to find HCF and LCM with lessers number of steps compared to the standard procedure. https://cdn.kastatic.org/ka-youtube-converted/c6Hp01PyMhA.mp4/c6Hp01PyMhA.mp4 157 Finding Common Ground https://www.khanacademy.org/math/class-7-ncf/x063f95a40c290960:finding-common-ground/x063f95a40c290960:property-involving-both-the-hcf-and-the-lcm/v/hcf-and-lcm-product 2021-06-02T12:43:23Z HCF and LCM product The product of the HCF and LCM of two numbers is equal to the product of the two numbers. Let's use this property to solve a few questions. We will prove why this is true in another video. Created by Aanand Srinivas. Aanand Srinivas video https://cdn.kastatic.org/googleusercontent/nhWnKu9jwmpwN9fPih7rkjyV6Jl6hyKegqTSdU8jQedTbeilRSlcQHI-LhN0X7wwJwLdjBkDTkVTtOMPRTRmmdQ HCF and LCM product The product of the HCF and LCM of two numbers is equal to the product of the two numbers. Let's use this property to solve a few questions. We will prove why this is true in another video. Created by Aanand Srinivas. https://cdn.kastatic.org/ka-youtube-converted/ED8P8vchQJM.mp4/ED8P8vchQJM.mp4 475 Finding Common Ground https://www.khanacademy.org/math/class-7-ncf/x063f95a40c290960:finding-common-ground/x063f95a40c290960:property-involving-both-the-hcf-and-the-lcm/e/lcm-hcf-product 2025-12-22T06:46:20.288709789Z HCF & LCM product Let's practice ashish exercise https://www.khanacademy.org/math/class-7-ncf/x063f95a40c290960:finding-common-ground/x063f95a40c290960:property-involving-both-the-hcf-and-the-lcm/e/relation-between-hcf-and-lcm-word-problem 2025-04-29T01:54:23.666207735Z Relation between HCF and LCM: word problem Practice solving word problems on the relationship between the HCF (Highest Common Factor) and the LCM (Least Common Multiple). Nurun Nahar Moon exercise https://www.khanacademy.org/math/class-7-ncf/x063f95a40c290960:finding-common-ground/x063f95a40c290960:property-involving-both-the-hcf-and-the-lcm/e/mhse-hcf-and-lcm 2025-05-19T02:23:26.592433445Z HCF and LCM HCF and LCM Ashish Gupta exercise https://www.khanacademy.org/math/class-7-ncf/x063f95a40c290960:finding-common-ground/x063f95a40c290960:property-involving-both-the-hcf-and-the-lcm/e/hcf-and-lcm-of-three-numbers-odia-new 2024-10-11T06:05:13.005982358Z HCF and LCM of three numbers . Aakash Bagga exercise