Maths, HCF and LCM
What are the factors of 20?
1, 20, 2, 10, 4, 5
What are the factors of 30?
1, 30, 2, 15, 3, 5
What is the HCF of 20 and 30?
10, it's the highest number that goes into both 20 and 30.
What is the HCF of 27 and 42?
3, it's the highest number that goes into both 27 and 42.
What is the HCF of 12 and 15?
3.
What is the LCM of 6 and 10?
30, they both go into that.
What is the LCM of 5 and 7?
35, in this case, you just multiply them together.
What is a HCF?
The HCF is the Highest Common Factor. It is the highest number that is divisible by both of the numbers given.
What is the LCM?
The LCM is the Lowest Common Multiple. It is the lowest number that the two numbers shown both go in to.
What is a factor?
The factor of a number is a number that goes into it and cannot be made any smaller.
