Just doing a bit of maths with DD - her idea, before anyone shouts at me for making her do work during the holidays - and I noticed that she still uses her fingers a lot to work out answers, eg. If I asked her what 24-17 is she automatically puts her fingers up to work it out, despite the fact that she is very good a tnumber bonds bonds so would know that it's 3 up to 20, then 4 the other side kind of thing. The thing is she is always accurate with her answers - the example I have given is just for demonstration - so does it really matter at this age??