Factors & Multiples
Factors are numbers you multiply together to get other numbers.
So for instance 2 and 5 and factors of 10, because 2 x 5 = 10
The other factors of 10 are 1 and 10, because 1 x 10 = 10
There are no other factors of 10 because no other numbers divides evenly into it.
Some numbers have a lot of factors. For example, how many factors of 100 can you find?
Still need help on factors? Make sure you keep practicing your times-tables!
Maths is Fun: Factors and Multiples (explanation)
Khan Academy: Factors and Multiples (video)
Khan Academy Finding factor pairs (practice)
Skills Check: Are you Ready to Learn about Prime Factorisation?
- Can you mentally work out if any number is divisible by 2,3,4,5,6,9 or 10?
- Can you easily identify if a number under 100 is prime?
- Can you name the next four multiples of any number under 100?
- Can you find the Lowest Common Multiple of any pair of numbers?
Prime Numbers & Prime Factorisation
Math is Fun: Factor Trees (explanation)
Khan: Prime Factorization (video)
Maths is Fun: Prime Factorisation (practice)
Khan Academy: Prime Factorisation (practice)
Extension:
How to find how many factors any number has (instructions)
Making square numbers by adding primes (activity)
Prime Magic (activity)
Peculiar Patterns in Primes (news article)
