https://www.khanacademy.org/math/cc-fourth-grade-math/imp-factors-multiples-and-patterns/imp-prime-and-composite-numbers/a/prime-composite-numbers 2021-06-21T15:29:09Z Prime and composite numbers intro Learn about prime and composite numbers and practice identifying them. article 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 Números primos y compuestos 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/a/prime-and-composite-review 2022-05-23T14:30:02.465161589Z Prime and composite numbers review Review prime and composite numbers, and try some practice problems. article 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 Números primos y compuestos 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/cc-fourth-grade-math/imp-factors-multiples-and-patterns/imp-prime-and-composite-numbers/e/prime-and-composite-numbers 2026-04-07T23:55:07.30621384Z Prime and composite numbers Practice identifying prime and composite numbers. Lindsay exercise