We can find the common multiples of two or more numbers by listing the multiples of each number and then finding their common multiples. For example, to find the common multiples of 3 and 4, we list their multiples and then find their common multiples. Multiples of 3: 3, 6, 9, 12, 15, 18, 21, 24, 27, 30, 33, 36.
Why do we use common factors?
“Factors” are numbers we can multiply together to get another number. When we find the factors of two or more numbers, and then find some factors are the same (“common”), then they are the “common factors”.
How do you find the lowest common multiple?
Highest common factor and lowest common multiple – This video finds the HCF by listing all the factors of each number, highlighting all the common factors and indicating the highest common factor. A similar method is used to find the LCM of two numbers.
How to find common factors of two numbers?
COMMON FACTORS – MAKING LISTSIf two numbers have the same factors, they are said to have common factors.One way to determine common factors of numbers is to make lists of the factors. 11. COMMON FACTORS – MAKING LISTSAnother example:
What can you do with factors and multiples?
The section ends with a game requiring students to find prime factors with a scoring system based on the answers given. This activity could be used as a plenary activity. Properties of number pack two contains a variety of activities investigating and using multiples and factors.
Which is an example of a common factor?
The maximum size of a square tile that can be used can be deduced with the help of common factors. As 15 is the highest common factor, a square tile of side length 15 cm should be used. Two numbers having only ‘1’ as their common factor are known as co-prime numbers. Example: 5 and 14, 6 and 17. Two prime numbers are always co-prime numbers.
