Curated Video
Finding the Highest Common Factor
In this video we explain two methods to find the highest common factor (also known as greatest common factor) of two or more numbers: by listing the factors or by prime factorisation. Practice questions and answers are at the end of the...
Khan Academy
Introduction to Ratios, Ratios, Rates, and Percentages, 6th Grade
Demonstrating the concept of ratios with several simple examples (animals, fruit, girls and boys in class), Sal guides viewers through finding and simplifying ratios. Even those who have difficulty grasping the concept of ratios will...
Khan Academy
Khan Academy: Greatest Common Divisor: Greatest Common Divisor
Example problems of determining the greatest common factor of two numbers by factoring those numbers first.
Art of Problem Solving
Art of Problem Solving: Lcm Times Gcd
Video tutorial uses examples and tricks to reinforce understanding of Least Common Multiple and Greatest Common Divisor. [6:26]