Video on finding factors: http://www.khanacademy.org/math/arithmetic/factors-multiples/divisibility_and_factors/v/finding-factors-of-a-number

Video on factors and multiples: http://www.khanacademy.org/math/arithmetic/factors-multiples/divisibility_and_factors/v/finding-factors-of-a-number

Practice factors of numbers: http://www.khanacademy.org/math/arithmetic/factors-multiples/divisibility_and_factors/e/divisibility_0.5

Video on factors and divisibility: http://www.khanacademy.org/math/arithmetic/factors-multiples/divisibility_and_factors/v/divisibility-intuition

Practice finding factors and divisibility: http://www.khanacademy.org/math/arithmetic/factors-multiples/divisibility_and_factors/e/divisibility_intuition

Video on what are prime numbers: http://www.khanacademy.org/math/arithmetic/factors-multiples/prime_numbers/v/prime-numbers

Video on recognizing prime numbers: http://www.khanacademy.org/math/arithmetic/factors-multiples/prime_numbers/v/recognizing-prime-numbers

Practice recognizing prime numbers: http://www.khanacademy.org/math/arithmetic/factors-multiples/prime_numbers/e/prime_numbers

Practice recognizing composite numbers: http://www.khanacademy.org/math/arithmetic/factors-multiples/prime_numbers/e/composite_numbers

Video Prime Factorization: http://www.khanacademy.org/math/arithmetic/factors-multiples/prime_factorization/v/prime-factorization

Video Prime Factorization examples: http://www.khanacademy.org/math/arithmetic/factors-multiples/prime_factorization/v/prime-factorization-exercise

Practice prime factorization: http://www.khanacademy.org/math/arithmetic/factors-multiples/prime_factorization/v/prime-factorization-exercise

Video on greatest common factor: http://www.educreations.com/lesson/view/prime-factorization-to-find-gcf-and-simplify-fract/17334499/?s=K7LuH3&ref=app

Video on factors and multiples: http://www.khanacademy.org/math/arithmetic/factors-multiples/divisibility_and_factors/v/finding-factors-of-a-number

Practice factors of numbers: http://www.khanacademy.org/math/arithmetic/factors-multiples/divisibility_and_factors/e/divisibility_0.5

Video on factors and divisibility: http://www.khanacademy.org/math/arithmetic/factors-multiples/divisibility_and_factors/v/divisibility-intuition

Practice finding factors and divisibility: http://www.khanacademy.org/math/arithmetic/factors-multiples/divisibility_and_factors/e/divisibility_intuition

Video on what are prime numbers: http://www.khanacademy.org/math/arithmetic/factors-multiples/prime_numbers/v/prime-numbers

Video on recognizing prime numbers: http://www.khanacademy.org/math/arithmetic/factors-multiples/prime_numbers/v/recognizing-prime-numbers

Practice recognizing prime numbers: http://www.khanacademy.org/math/arithmetic/factors-multiples/prime_numbers/e/prime_numbers

Practice recognizing composite numbers: http://www.khanacademy.org/math/arithmetic/factors-multiples/prime_numbers/e/composite_numbers

Video Prime Factorization: http://www.khanacademy.org/math/arithmetic/factors-multiples/prime_factorization/v/prime-factorization

Video Prime Factorization examples: http://www.khanacademy.org/math/arithmetic/factors-multiples/prime_factorization/v/prime-factorization-exercise

Practice prime factorization: http://www.khanacademy.org/math/arithmetic/factors-multiples/prime_factorization/v/prime-factorization-exercise

Video on greatest common factor: http://www.educreations.com/lesson/view/prime-factorization-to-find-gcf-and-simplify-fract/17334499/?s=K7LuH3&ref=app