The idea is that your child completely understands that 5 is made up of two smaller numbers e.g. they know that 5 can be made up of 4 and 1 but also from 3 and 2 and from 2 and 3. See if they can find all of the ways to make 5 in this game and then explain to you how they know they have found all of the ways. They may wish to record this in in a way that makes sense to them to prove they have found all of the ways and that there are no other ways left to find. Good Luck!
If you would like a challenge then do the activity above but with a larger number.We suggest you start with 6 and then 7 etc.