# Year 6: Revise common multiples

Children in Year 6 will probably need some revision of multiples, especially common multiples and finding the lowest (least) common multiple (LCM). We get a multiple of a number when we multiply it by another whole number (not zero).

Multiples of 3 are 3, 6, 9, 12, 15, 18, 21 and so on.

Children should recognise the link with multiplication tables.

Common multiples are multiples that are common to two or more numbers.

To find the lowest common multiple, lists of multiples of both numbers need to be made. For example the LCM of 3 and 5:

Multiples of 3 are 3, 6, 9, 12, 15, 18, 21, 24, 27, 30 and so on.

Multiples of 5 are 5, 10, 15, 20, 25, 30, 35 and so on.

15 is the lowest number that appears in both lists so the LCM of 3 and 5 is 15.

We have just added a further set of pages on this for Year 6 children, which can be found in our Multiplication category.