https://www.khanacademy.org/math/cc-seventh-grade-math/cc-7th-negative-numbers-multiply-and-divide/cc-7th-order-of-operations/v/introduction-to-order-of-operations 2021-06-30T17:51:15Z Intro to order of operations This example shows the steps and clarifies the purpose of order of operations: to have ONE way to interpret a mathematical statement. Sal Khan video https://cdn.kastatic.org/googleusercontent/Md5wekOSO60Ph5P1tZeHoTUFidkbmwISU2mneYRCmz8FCQtfAX6_zTtcUwMatbbD-0H9HVK5IMLZpeIhipDk244E Intro to order of operations This example shows the steps and clarifies the purpose of order of operations: to have ONE way to interpret a mathematical statement. https://cdn.kastatic.org/ka-youtube-converted/ClYdw4d4OmA.mp4/ClYdw4d4OmA.mp4 580 Know More About Numbers https://www.khanacademy.org/math/cc-sixth-grade-math/x0267d782:cc-6th-exponents-and-order-of-operations/cc-6th-order-of-operations/v/order-operations-intro 2023-06-20T16:37:38.979390737Z Order of operations introduction The order of operations is a crucial math concept that ensures consistent results when solving problems with multiple operations. By following PEMDAS (Parentheses, Exponents, Multiplication and Division, and Addition and Subtraction), students can accurately evaluate expressions and avoid common mistakes. Mastering this skill is essential for success in mathematics. Sal Khan video https://cdn.kastatic.org/ka_thumbnails_cache/4af27664-a7b5-425e-9f46-f51d8348ffc2_1280_720_base.png Order of operations introduction The order of operations is a crucial math concept that ensures consistent results when solving problems with multiple operations. By following PEMDAS (Parentheses, Exponents, Multiplication and Division, and Addition and Subtraction), students can accurately evaluate expressions and avoid common mistakes. Mastering this skill is essential for success in mathematics. https://cdn.kastatic.org/ka-youtube-converted/eoYThjIAhOc.mp4/eoYThjIAhOc.mp4 273 Know More About Numbers https://www.khanacademy.org/math/cc-sixth-grade-math/x0267d782:cc-6th-exponents-and-order-of-operations/cc-6th-order-of-operations/v/more-complicated-order-of-operations-example 2023-06-14T19:01:04.581019455Z Worked example: Order of operations (PEMDAS) The order of operations (PEMDAS) is essential for solving complex math problems. PEMDAS stands for Parentheses, Exponents, Multiplication and Division (same level), and Addition and Subtraction (same level). By following these steps, you can simplify and accurately solve mathematical expressions, ensuring a correct final answer. Sal Khan video https://cdn.kastatic.org/googleusercontent/EyFwTWmK-Z4L-ad579psD0Nh-Tm9UrWze-eVh-sR6fFnibJ5eax4CT94erZzttGuvAd2O6_D6tuTd7i0x2gqPIo Worked example: Order of operations (PEMDAS) The order of operations (PEMDAS) is essential for solving complex math problems. PEMDAS stands for Parentheses, Exponents, Multiplication and Division (same level), and Addition and Subtraction (same level). By following these steps, you can simplify and accurately solve mathematical expressions, ensuring a correct final answer. https://cdn.kastatic.org/ka-youtube-converted/piIcRV2dx7E.mp4/piIcRV2dx7E.mp4 320 Know More About Numbers https://www.khanacademy.org/math/up-class-6/x2ec1f0ce05d75c9d:integers-up-new/x2ec1f0ce05d75c9d:use-of-brackets-up-new/e/order-of-operations-with-only-addition-subtraction-multiplication-and-division-up-new 2024-05-01T13:20:24.831874259Z Order of operations with only addition, subtraction, multiplication and division . Aakash Bagga exercise https://www.khanacademy.org/math/revision-term-1-up-math-class-6/x12e32098b1dd242b:week-1/x12e32098b1dd242b:integers/e/integers-3-f 2025-02-04T09:38:17.081068692Z BODMAS Bodmas basic and regular integers and brackets only ashish exercise https://www.khanacademy.org/math/6th-engage-ny/engage-6th-module-2/6th-module-2-topic-d/v/divisibility-tests-for-2-3-4-5-6-9-10 2020-12-29T16:19:55Z Divisibility tests for 2, 3, 4, 5, 6, 9, 10 Worked example of basic divisibility tests. Sal Khan video https://cdn.kastatic.org/googleusercontent/5cSLL1AxvANtGA9oFHlOFtHk-RRoQoO-YNAKhgx-Gqd-VS-20j9paPrqykvg_4OZYwm6_3t7npfvrO0TX9oUIbo Divisibility tests for 2, 3, 4, 5, 6, 9, 10 Worked example of basic divisibility tests. https://cdn.kastatic.org/ka-youtube-converted/Df9h5t64NlQ.mp4/Df9h5t64NlQ.mp4 393 Know More About Numbers https://www.khanacademy.org/math/class-6-ncf/x04ca845a9a148c80:prime-time/x04ca845a9a148c80:divisibility-tests/v/divisibility-tests-of-8-11-and-12 2024-05-29T07:44:09.146521489Z Divisibility tests of 8, 11 and 12 Description In this video we discuss the divisibility tests of 8 ,11 and 12 Devashish Phadnis video https://cdn.kastatic.org/googleusercontent/ZCdwTudJg6e6n-P2gsaUborP4izvMsGo71pvEVlX9dNYWcLXcP7VHkWpn2grt4TUP1KoJLQP9NswyHBuBLSFTBw Divisibility tests of 8, 11 and 12 Description In this video we discuss the divisibility tests of 8 ,11 and 12 https://cdn.kastatic.org/ka-youtube-converted/I2r4zXvXan8.mp4/I2r4zXvXan8.mp4 264 Know More About Numbers https://www.khanacademy.org/math/6th-engage-ny/engage-6th-module-2/6th-module-2-topic-d/v/recognizing-divisibility 2020-09-21T17:06:11Z Recognizing divisibility Recognizing Divisibility. Sal Khan video https://cdn.kastatic.org/googleusercontent/6K5qnnQK_xQLR4g11hTPQbJqxnNznuT7kz2oMt_PVTd0VlznUxE_S6VpK9ao-_ab1JrTe0rAmCEhOJdkg0sUE1I Recognizing divisibility Recognizing Divisibility. https://cdn.kastatic.org/ka-youtube-converted/2G_Jr_XpnY4.mp4/2G_Jr_XpnY4.mp4 386 Know More About Numbers https://www.khanacademy.org/math/6th-engage-ny/engage-6th-module-2/6th-module-2-topic-d/e/divisibility_tests 2025-08-13T02:25:06.078514402Z Divisibility tests Ben Eater exercise https://www.khanacademy.org/math/revision-term-1-tg-math-lass-6/x0ef789b44aba665e:week-2/x0ef789b44aba665e:playing-with-numbers/e/advanced--divisibility-test-for-8-and-11 2025-01-30T02:03:08.999023639Z Divisibility tests for 8 and 11 Check if a given number is divisible by 8 or 11 using divisibility rules. Aanand exercise https://www.khanacademy.org/math/cc-fourth-grade-math/imp-factors-multiples-and-patterns/imp-factors-and-multiples/v/finding-factors-of-a-number 2021-06-30T17:51:04Z Finding factors of a number Sal finds the factors of 120. Sal Khan video https://cdn.kastatic.org/googleusercontent/speITUHaiocvGlpcpeXMJFL8cB49kirFe6BwV7T24VkITJgKdgVaxkH43maWPX8eCrFy9W69JJhzYVBCgtNC8go Finding factors of a number Sal finds the factors of 120. https://cdn.kastatic.org/ka-youtube-converted/vcn2ruTOwFo.mp4/vcn2ruTOwFo.mp4 593 Know More About Numbers 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/v/identifying-multiples 2022-10-06T09:48:27.705455518Z Identifying multiples Use skip counting and division to identify multiples of 9. Sal Khan video https://cdn.kastatic.org/ka_thumbnails_cache/30e319f8-5ed5-4a96-89eb-6ad92162bdb4_1280_720_base.png Identifying multiples Use skip counting and division to identify multiples of 9. https://cdn.kastatic.org/ka-youtube-converted/U5L_aaQ6pYQ.mp4/U5L_aaQ6pYQ.mp4 240 Know More About Numbers 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/cc-fourth-grade-math/imp-factors-multiples-and-patterns/imp-factors-and-multiples/v/finding-factors-and-multiples 2021-06-21T15:29:05Z Finding factors and multiples Sal uses divisibility rules to determine if numbers are factors of 154 and then finds multiples of 14. Sal Khan video https://cdn.kastatic.org/googleusercontent/jNxayzR0Zz0f-pbmaFONjMCJ5Bodc5QpIuPX1hhmWzk4BSXDSDMZkzXBB5xwAMxyAcnIOwOWDBiyJ85dlRuIWyvD 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/5xe-6GPR_qQ.mp4/5xe-6GPR_qQ.mp4 240 Know More About Numbers https://www.khanacademy.org/math/cc-fourth-grade-math/imp-factors-multiples-and-patterns/imp-factors-and-multiples/e/identifying-factors-and-multiples 2026-03-15T17:11:10.340789021Z Relate factors and multiples Demonstrate understanding of factors and multiples. Lindsay Spears exercise https://www.khanacademy.org/math/math-nsdc-eng/x0a43a548b892fe12:factors-and-multiples/x0a43a548b892fe12:untitled-137/e/intro-to-factors-and-multiples 2024-10-11T06:05:13.005982358Z Properties of factors and multiples Intro to factors and multiples anmol exercise https://www.khanacademy.org/math/cc-fourth-grade-math/imp-factors-multiples-and-patterns/imp-prime-and-composite-numbers/v/prime-numbers 2021-06-21T15:29:12Z Prime numbers Prime numbers are numbers that have only 2 factors: 1 and themselves. For example, the first 5 prime numbers are 2, 3, 5, 7, and 11. By contrast, numbers with more than 2 factors are call composite numbers. Sal Khan video https://cdn.kastatic.org/googleusercontent/sybkK0hAAkEE-Ubw97XuaaOw80eEcS9b8X9i8GmF5nQcz2rGJcxEJvcACkMi6bzEiYhJbkaaklYEhPaKU79McX-3 Prime numbers Prime numbers are numbers that have only 2 factors: 1 and themselves. For example, the first 5 prime numbers are 2, 3, 5, 7, and 11. By contrast, numbers with more than 2 factors are call composite numbers. https://cdn.kastatic.org/ka-youtube-converted/mIStB5X4U8M.mp4/mIStB5X4U8M.mp4 493 Know More About Numbers https://www.khanacademy.org/math/cc-fourth-grade-math/imp-factors-multiples-and-patterns/imp-prime-and-composite-numbers/v/recognizing-prime-numbers 2021-06-21T15:29:05Z Recognizing prime and composite numbers Can you recognize the prime numbers in this group of numbers? Which are prime, composite, or neither? Sal Khan video https://cdn.kastatic.org/googleusercontent/3CUVy3dSECgSfUGKi3RzIaOtOmHZYUAof3q6vaMavHwEy58o3myPKm7bNTBW4qJi9ZJ_siacCvXZcAlrcbqtMlzx 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/3h4UK62Qrbo.mp4/3h4UK62Qrbo.mp4 280 Know More About Numbers https://www.khanacademy.org/math/cc-fourth-grade-math/imp-factors-multiples-and-patterns/imp-prime-and-composite-numbers/e/prime_numbers 2025-01-31T11:23:03.723679407Z Identify prime numbers Identify prime numbers less than 100. Marcia Lee exercise https://www.khanacademy.org/math/cc-fourth-grade-math/imp-factors-multiples-and-patterns/imp-prime-and-composite-numbers/e/composite_numbers 2025-01-31T11:23:03.723679407Z Identify composite numbers Identify composite numbers less than 100. Ben Alpert 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 Know More About Numbers 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-6-ncf/x04ca845a9a148c80:prime-time/x04ca845a9a148c80:co-prime-numbers/e/identify-pair-of-co-prime-numbers 2025-02-25T11:20:34.857789849Z Identify co-prime numbers Identify whether a pair of numbers is co-prime or not. Aanand exercise https://www.khanacademy.org/math/pre-algebra/pre-algebra-factors-multiples/pre-algebra-prime-factorization-prealg/v/prime-factorization-exercise 2023-04-15T06:13:13.904395317Z Prime factorization exercise Learn to find the prime factorization of any number by breaking it down into its prime factors. Understand the difference between prime and composite numbers. Learn from guided examples of finding the prime factorization of 36, 30, and 73. Sal Khan video https://cdn.kastatic.org/googleusercontent/npQ9IhM6nfJTsvrfSFyFDAh05y0B5oZRomUSooEWkLoSBu5y-HaanKRLAVrB1LY-RpYZDz8qCfbA5NidWLuWhvpjdw Prime factorization exercise Learn to find the prime factorization of any number by breaking it down into its prime factors. Understand the difference between prime and composite numbers. Learn from guided examples of finding the prime factorization of 36, 30, and 73. https://cdn.kastatic.org/ka-youtube-converted/XWq8bplP-_E.mp4/XWq8bplP-_E.mp4 229 Know More About Numbers 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/cc-sixth-grade-math/cc-6th-expressions-and-variables/cc-6th-gcf/v/greatest-common-divisor 2023-05-23T10:28:13.689545116Z 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. Sal Khan video https://cdn.kastatic.org/googleusercontent/_zOUMiaOFZknL-4w9DdBzJhAyQL61EQ3l6GsyOZg7kA1PErFh2nT1W4BxxmnEV8VfiC--sELaDPNQ4ajKanUMuDtNg 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/jFd-6EPfnec.mp4/jFd-6EPfnec.mp4 380 Know More About Numbers https://www.khanacademy.org/math/cc-sixth-grade-math/cc-6th-expressions-and-variables/cc-6th-gcf/v/greatest-common-divisor-factor-exercise 2021-06-28T22:10:39Z Greatest common factor examples The greatest common factor (GCF) of a set of numbers is the largest factor that all the numbers share. For example, 12, 20, and 24 have two common factors: 2 and 4. The largest is 4, so we say that the GCF of 12, 20, and 24 is 4. GCF is often used to find common denominators. Sal Khan video https://cdn.kastatic.org/googleusercontent/XdoeVt612nBL8cN5yVhH3pn3aa7bI3pANnA6FcLSeAj5go5pP76bz61XYlJltoSNaM2vMnoN4OzXYQR33gd0lt62 Greatest common factor examples The greatest common factor (GCF) of a set of numbers is the largest factor that all the numbers share. For example, 12, 20, and 24 have two common factors: 2 and 4. The largest is 4, so we say that the GCF of 12, 20, and 24 is 4. GCF is often used to find common denominators. https://cdn.kastatic.org/ka-youtube-converted/bLTfBvkrfsM.mp4/bLTfBvkrfsM.mp4 410 Know More About Numbers 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/cc-sixth-grade-math/cc-6th-expressions-and-variables/cc-6th-lcm/v/least-common-multiple-exercise 2023-05-23T10:28:13.689545116Z 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. Sal Khan video https://cdn.kastatic.org/googleusercontent/SCzY_4g9WMfUlBRCKnOMgSzFmY9HmhBR1cHHpnJWDoqxtZD2DgYX0XwTX8vnHzoPD7U6k3x2deiSlW-UUFP9log 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/znmPfDfsir8.mp4/znmPfDfsir8.mp4 256 Know More About Numbers 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 Know More About Numbers 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: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 Know More About Numbers 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/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 Know More About Numbers 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