Here's a game from BBC Bitesize about multiples and factors.
Sometimes people get confused about factors and multiples. They both relate to multiplying and dividing, but are in opposite directions.
The word multiple means many and sounds like multiply doesn't it? So if you multiply a number by something you get its multiples.
Multiples of 5 include: 10, 15, 30, 56 and...... think of some more...
Factors are numbers that you get from division. Think of a number.... hmmmmm... 24.
24 has lots of factors because lots of numbers go into it evenly (without a remainder), like.... 12, 2, 6 and..... think of some more.
Now have a go at the game:
What type of number only has two factors? Can you think of some examples?